ChimeraX bug report submission

[goddard@…]

The following bug report has been submitted:
Platform:        Darwin-19.3.0-x86_64-i386-64bit
ChimeraX Version: 0.94 (2020-04-11)
Description
Not showing ribbons.  Mouse hover produced this error.

Log:
UCSF ChimeraX version: 0.94.dev202004110533 (2020-04-11)  
© 2016-2020 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open 3dkn

Summary of feedback from opening 3dkn fetched from pdb  
---  
note | Fetching compressed mmCIF 3dkn from
http://files.rcsb.org/download/3dkn.cif  
  
3dkn title:  
Sec61 in the Canine ribosome-channel complex from the endoplasmic reticulum
[more info...]  
  
Chain information for 3dkn #1  
---  
Chain | Description  
A | Preprotein translocase subunit secY  
B | Preprotein translocase subunit secE  
C | Preprotein translocase subunit secG  
D | RNA
(5'-R(P*CP*GP*up*GP*CP*CP*ap*ap*GP*CP*up*GP*CP*GP*ap*up*ap*ap*GP*C)-3')  
E | RNA (5'-R(P*ap*GP*CP*CP*GP*CP*ap*CP*GP*GP*ap*GP*GP*CP*GP*ap*A)-3')  
F | RNA (32-mer)  
  
  

> close

> open 5ijo

Summary of feedback from opening 5ijo fetched from pdb  
---  
note | Fetching compressed mmCIF 5ijo from
http://files.rcsb.org/download/5ijo.cif  
  
5ijo title:  
Alternative composite structure of the inner ring of the human nuclear pore
complex (16 copies of Nup188, 16 copies of Nup205) [more info...]  
  
Chain information for 5ijo #1  
---  
Chain | Description  
A B E K Q W | Nuclear pore complex protein Nup155  
C I O U | Nuclear pore complex protein Nup93  
D P | Nuclear pore complex protein Nup205  
F L R X | Nucleoporin p54  
G M S Y | Nucleoporin p58/p45  
H N T Z | Nuclear pore glycoprotein p62  
J V | Nucleoporin NUP188 homolog  
  
5ijo mmCIF Assemblies  
---  
1| author_defined_assembly  
  
  

> sym #1 assembly 1

> view

> set bgColor white

> lighting soft

Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/triggerset.py", line 130, in invoke  
return self._func(self._name, data)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/trackpad.py", line 48, in <lambda>  
h = t.add_handler('new frame', lambda tname, tdata:
self._collapse_touch_events())  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/trackpad.py", line 103, in
_collapse_touch_events  
self._process_touches(touches)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/trackpad.py", line 140, in _process_touches  
self._rotate((dy, dx, 0), angle)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/trackpad.py", line 164, in _rotate  
v.rotate(axis, angle)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 927, in rotate  
center = self.center_of_rotation  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 654, in _get_cofr  
cofr = self._compute_center_of_rotation()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 681, in _compute_center_of_rotation  
p = self._front_center_cofr()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 749, in _front_center_cofr  
cr = self._front_center_point() # Can be None  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 759, in _front_center_point  
exclude=lambda d: hasattr(d, 'no_cofr') and d.no_cofr)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 774, in first_intercept  
p = self.first_intercept_on_segment(xyz1, xyz2, exclude=exclude,
beyond=beyond)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
Error processing trigger "new frame":  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/updateloop.py", line 139, in _redraw_timer_callback  
self.session.ui.mouse_modes.mouse_pause_tracking()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 362, in
mouse_pause_tracking  
self._mouse_pause()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 466, in _mouse_pause  
m.pause(self._mouse_pause_position)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/std_modes.py", line 623, in pause  
p = picked_object(x, y, self.view)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 613, in picked_object  
exclude = exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 617, in
picked_object_on_segment  
p2 = p = view.first_intercept_on_segment(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/view.py", line 788, in first_intercept_on_segment  
p = self.drawing.first_intercept(xyz1, xyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 986, in first_intercept  
p = self.first_intercept_children(self.child_drawings(), mxyz1, mxyz2,
exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/graphics/drawing.py", line 1002, in first_intercept_children  
p = d.first_intercept(cxyz1, cxyz2, exclude=exclude)  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 580, in first_intercept  
b = self._pick_bounds()  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
ImportError: cannot import name 'RibbonDrawing' from 'chimerax.atomic.ribbon'
(/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/ribbon.py)  
  
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/atomic/structure.py", line 604, in _pick_bounds  
from .ribbon import RibbonDrawing  
  
See log for complete Python traceback.  
  




OpenGL version: 4.1 ATI-3.5.5
OpenGL renderer: AMD Radeon Pro Vega 20 OpenGL Engine
OpenGL vendor: ATI Technologies Inc.