The error is a failure in the ChimeraX session restore for ArtiaX. It means the session somehow contains a closed model. Possibly the you encountered an error in ChimeraX before you saved the session which caused a model not to be fully deleted and then you saved a session with this corrupted state. No way for me to know without seeing the session file. To report a bug in ChimeraX you should use the Report Bug button that appears in ChimeraX when the error occurs. You could attach the problem session file to the bug report if the data is not private and we could look at whether there is a way to recover it. Tom
On Mar 11, 2026, at 3:24 AM, 255426--- via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:
I have a similar problem with ChimeraX 1.11.1 on Windows 11.
Unable to restore session, resetting.
Traceback (most recent call last): File "C:\Program Files\ChimeraX 1.11.1\bin\Lib\site-packages\chimerax\core\session.py", line 863, in restore obj = sm.restore_snapshot(self, data) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\a\AppData\Local\UCSF\ChimeraX\1.11\Python311\site-packages\chimerax\artiax\particle\ParticleList.py", line 1232, in restore_snapshot pl.collection_model.displayed_child_positions = copy(pl._displayed_particles) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Program Files\ChimeraX 1.11.1\bin\Lib\site-packages\chimerax\graphics\drawing.py", line 266, in __setattr__ super(Drawing, self).__setattr__(key, value) File "C:\Users\a\AppData\Local\UCSF\ChimeraX\1.11\Python311\site-packages\chimerax\artiax\particle\SurfaceCollectionModel.py", line 292, in displayed_child_positions col.display_positions = copy(value) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Program Files\ChimeraX 1.11.1\bin\Lib\site-packages\chimerax\graphics\drawing.py", line 266, in __setattr__ super(Drawing, self).__setattr__(key, value) File "C:\Program Files\ChimeraX 1.11.1\bin\Lib\site-packages\chimerax\graphics\drawing.py", line 418, in set_display_positions self._any_displayed_positions = (position_mask.sum() > 0) ^^^^^^^^^^^^^^^^^^^^^^^ TypeError: '>' not supported between instances of 'NoneType' and 'int' _______________________________________________ ChimeraX-users mailing list -- chimerax-users@cgl.ucsf.edu To unsubscribe send an email to chimerax-users-leave@cgl.ucsf.edu Archives: https://mail.cgl.ucsf.edu/mailman/archives/list/chimerax-users@cgl.ucsf.edu/