Problem removing existing sequence viewer during session restore

[marek.sebesta@…]

The following bug report has been submitted:
Platform:        macOS-10.16-x86_64-i386-64bit
ChimeraX Version: 1.2.5 (2021-05-24 04:13:57 UTC)
Description
(Describe the actions that caused this problem to occur here)

Log:
UCSF ChimeraX version: 1.2.5 (2021-05-24)  
© 2016-2021 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open 4OWX

Summary of feedback from opening 4OWX fetched from pdb  
---  
note | Fetching compressed mmCIF 4owx from
http://files.rcsb.org/download/4owx.cif  
  
4owx title:  
Structural basis of SOSS1 in complex with a 12nt ssDNA [more info...]  
  
Chain information for 4owx #1  
---  
Chain | Description  
A | Integrator complex subunit 3  
B | SOSS complex subunit B1  
L | DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*T)-3')  
  

> select /B:5-111

827 atoms, 841 bonds, 107 residues, 1 model selected  

> sequence chain #1/B

Alignment identifier is 1/B  

> select /B:111

7 atoms, 7 bonds, 1 residue, 1 model selected  

> select /B:111

7 atoms, 7 bonds, 1 residue, 1 model selected  

> select /B:74-75

17 atoms, 17 bonds, 2 residues, 1 model selected  

> select /B:74-75

17 atoms, 17 bonds, 2 residues, 1 model selected  

> select /B:74

12 atoms, 12 bonds, 1 residue, 1 model selected  

> select /B:74

12 atoms, 12 bonds, 1 residue, 1 model selected  

> select /B:74,85

24 atoms, 24 bonds, 2 residues, 1 model selected  

> show sel atoms

> open /Users/mareksebesta/Desktop/hSSB1-dT35_labelled_Ys.cxs

Unable to restore session, resetting.  
  
Traceback (most recent call last):  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/session.py", line 679, in restore  
self.reset()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/session.py", line 529, in reset  
sm.reset_state(container, self)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seqalign/manager.py", line 252, in reset_state  
alignment._destroy()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seqalign/alignment.py", line 603, in _destroy  
self._notify_observers(self.NOTE_DESTROYED, None)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seqalign/alignment.py", line 652, in _notify_observers  
recipient.alignment_notification(note_name, note_data)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seq-view/tool.py", line 474, in alignment_notification  
self.delete()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seq-view/tool.py", line 512, in delete  
ToolInstance.delete(self)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/tools.py", line 154, in delete  
self.session.ui.remove_tool(self)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/gui.py", line 345, in remove_tool  
self.main_window.remove_tool(tool_instance)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/gui.py", line 725, in remove_tool  
tw._destroy()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/gui.py", line 2049, in _destroy  
self.__toolkit.destroy()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/gui.py", line 2189, in destroy  
sbar.destroy()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/statusbar.py", line 51, in destroy  
v.delete()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/graphics/opengl.py", line 438, in delete  
self.make_current()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/graphics/opengl.py", line 478, in make_current  
return self._opengl_context.make_current()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/graphics/opengl.py", line 99, in make_current  
qc = self._initialize_context()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/graphics/opengl.py", line 125, in _initialize_context  
qc.setScreen(self._screen)  
RuntimeError: wrapped C/C++ object of type QScreen has been deleted  
  
Traceback (most recent call last):  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/session.py", line 679, in restore  
self.reset()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/session.py", line 529, in reset  
sm.reset_state(container, self)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seqalign/manager.py", line 252, in reset_state  
alignment._destroy()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seqalign/alignment.py", line 603, in _destroy  
self._notify_observers(self.NOTE_DESTROYED, None)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seqalign/alignment.py", line 652, in _notify_observers  
recipient.alignment_notification(note_name, note_data)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seq-view/tool.py", line 474, in alignment_notification  
self.delete()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seq-view/tool.py", line 512, in delete  
ToolInstance.delete(self)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/tools.py", line 154, in delete  
self.session.ui.remove_tool(self)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/gui.py", line 345, in remove_tool  
self.main_window.remove_tool(tool_instance)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/gui.py", line 725, in remove_tool  
tw._destroy()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/gui.py", line 2049, in _destroy  
self.__toolkit.destroy()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/gui.py", line 2189, in destroy  
sbar.destroy()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/statusbar.py", line 51, in destroy  
v.delete()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/graphics/opengl.py", line 438, in delete  
self.make_current()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/graphics/opengl.py", line 478, in make_current  
return self._opengl_context.make_current()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/graphics/opengl.py", line 99, in make_current  
qc = self._initialize_context()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/graphics/opengl.py", line 125, in _initialize_context  
qc.setScreen(self._screen)  
RuntimeError: wrapped C/C++ object of type QScreen has been deleted  
  
During handling of the above exception, another exception occurred:  
  
Traceback (most recent call last):  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/gui.py", line 261, in event  
_open_dropped_file(self.session, event.file())  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/ui/gui.py", line 1812, in _open_dropped_file  
run(session, 'open %s' % FileNameArg.unparse(path))  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/commands/run.py", line 36, in run  
results = command.run(text, log=log, return_json=return_json)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/commands/cli.py", line 2852, in run  
result = ci.function(session, **kw_args)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/open_command/cmd.py", line 118, in cmd_open  
models = Command(session, registry=registry).run(provider_cmd_text,
log=log)[0]  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/commands/cli.py", line 2852, in run  
result = ci.function(session, **kw_args)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/open_command/cmd.py", line 179, in provider_open  
models, status = collated_open(session, None, [data], data_format,
_add_models,  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/open_command/cmd.py", line 422, in collated_open  
return func(*func_args, **func_kw)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core_formats/__init__.py", line 26, in open  
return cxs_open(session, data, **kw)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/session.py", line 982, in open  
session.restore(stream, path=path, resize_window=resize_window)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/session.py", line 721, in restore  
self.reset()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/session.py", line 529, in reset  
sm.reset_state(container, self)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/core/tools.py", line 292, in reset_state  
tool_inst.delete()  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seq-view/tool.py", line 507, in delete  
self.alignment.detach_viewer(self)  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seqalign/alignment.py", line 379, in detach_viewer  
self.viewers.remove(viewer)  
ValueError: list.remove(x): x not in list  
  
ValueError: list.remove(x): x not in list  
  
File
"/Applications/ChimeraX-1.2.5.app/Contents/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-
packages/chimerax/seqalign/alignment.py", line 379, in detach_viewer  
self.viewers.remove(viewer)  
  
See log for complete Python traceback.  
  




OpenGL version: 4.1 INTEL-18.4.6
OpenGL renderer: Intel(R) Iris(TM) Plus Graphics OpenGL Engine
OpenGL vendor: Intel Inc.Hardware:

    Hardware Overview:

      Model Name: MacBook Pro
      Model Identifier: MacBookPro16,2
      Processor Name: Quad-Core Intel Core i5
      Processor Speed: 2 GHz
      Number of Processors: 1
      Total Number of Cores: 4
      L2 Cache (per Core): 512 KB
      L3 Cache: 6 MB
      Hyper-Threading Technology: Enabled
      Memory: 16 GB
      System Firmware Version: 1715.81.2.0.0 (iBridge: 19.16.10744.0.0,0)
      OS Loader Version: 540.80.2~11

Software:

    System Software Overview:

      System Version: macOS 12.2.1 (21D62)
      Kernel Version: Darwin 21.3.0
      Time since boot: 52 days 18:56

Graphics/Displays:

    Intel Iris Plus Graphics:

      Chipset Model: Intel Iris Plus Graphics
      Type: GPU
      Bus: Built-In
      VRAM (Dynamic, Max): 1536 MB
      Vendor: Intel
      Device ID: 0x8a53
      Revision ID: 0x0007
      Metal Family: Supported, Metal GPUFamily macOS 2
      Displays:
        Color LCD:
          Display Type: Built-In Retina LCD
          Resolution: 2560 x 1600 Retina
          Framebuffer Depth: 30-Bit Color (ARGB2101010)
          Main Display: Yes
          Mirror: Off
          Online: Yes
          Automatically Adjust Brightness: Yes
          Connection Type: Internal
        U2790B:
          Resolution: 3840 x 2160 (2160p/4K UHD 1 - Ultra High Definition)
          UI Looks like: 3840 x 2160 @ 30.00Hz
          Framebuffer Depth: 30-Bit Color (ARGB2101010)
          Mirror: Off
          Online: Yes
          Rotation: Supported
          Automatically Adjust Brightness: Yes
          Connection Type: DVI or HDMI
          Adapter Firmware Version: 7,55

Locale: (None, 'UTF-8')
PyQt5 5.15.2, Qt 5.15.2
Installed Packages:
    alabaster: 0.7.12
    appdirs: 1.4.4
    appnope: 0.1.2
    Babel: 2.9.1
    backcall: 0.2.0
    blockdiag: 2.0.1
    certifi: 2020.12.5
    cftime: 1.5.0
    chardet: 3.0.4
    ChimeraX-AddCharge: 1.0.1
    ChimeraX-AddH: 2.1.6
    ChimeraX-AlignmentAlgorithms: 2.0
    ChimeraX-AlignmentHdrs: 3.2
    ChimeraX-AlignmentMatrices: 2.0
    ChimeraX-Alignments: 2.1
    ChimeraX-AmberInfo: 1.0
    ChimeraX-Arrays: 1.0
    ChimeraX-Atomic: 1.13.2
    ChimeraX-AtomicLibrary: 3.1.3
    ChimeraX-AtomSearch: 2.0
    ChimeraX-AtomSearchLibrary: 1.0
    ChimeraX-AxesPlanes: 2.0
    ChimeraX-BasicActions: 1.1
    ChimeraX-BILD: 1.0
    ChimeraX-BlastProtein: 1.1
    ChimeraX-BondRot: 2.0
    ChimeraX-BugReporter: 1.0
    ChimeraX-BuildStructure: 2.5.2
    ChimeraX-Bumps: 1.0
    ChimeraX-BundleBuilder: 1.1
    ChimeraX-ButtonPanel: 1.0
    ChimeraX-CageBuilder: 1.0
    ChimeraX-CellPack: 1.0
    ChimeraX-Centroids: 1.1
    ChimeraX-ChemGroup: 2.0
    ChimeraX-Clashes: 2.1
    ChimeraX-ColorActions: 1.0
    ChimeraX-ColorGlobe: 1.0
    ChimeraX-ColorKey: 1.2.1
    ChimeraX-CommandLine: 1.1.4
    ChimeraX-ConnectStructure: 2.0
    ChimeraX-Contacts: 1.0
    ChimeraX-Core: 1.2.5
    ChimeraX-CoreFormats: 1.0
    ChimeraX-coulombic: 1.1.1
    ChimeraX-Crosslinks: 1.0
    ChimeraX-Crystal: 1.0
    ChimeraX-CrystalContacts: 1.0
    ChimeraX-DataFormats: 1.1
    ChimeraX-Dicom: 1.0
    ChimeraX-DistMonitor: 1.1.3
    ChimeraX-DistUI: 1.0
    ChimeraX-Dssp: 2.0
    ChimeraX-EMDB-SFF: 1.0
    ChimeraX-ExperimentalCommands: 1.0
    ChimeraX-FileHistory: 1.0
    ChimeraX-FunctionKey: 1.0
    ChimeraX-Geometry: 1.1
    ChimeraX-gltf: 1.0
    ChimeraX-Graphics: 1.0
    ChimeraX-Hbonds: 2.1
    ChimeraX-Help: 1.1
    ChimeraX-HKCage: 1.3
    ChimeraX-IHM: 1.0
    ChimeraX-ImageFormats: 1.1
    ChimeraX-IMOD: 1.0
    ChimeraX-IO: 1.0.1
    ChimeraX-Label: 1.0
    ChimeraX-ListInfo: 1.1.1
    ChimeraX-Log: 1.1.2
    ChimeraX-LookingGlass: 1.1
    ChimeraX-Maestro: 1.8.1
    ChimeraX-Map: 1.0.2
    ChimeraX-MapData: 2.0
    ChimeraX-MapEraser: 1.0
    ChimeraX-MapFilter: 2.0
    ChimeraX-MapFit: 2.0
    ChimeraX-MapSeries: 2.0
    ChimeraX-Markers: 1.0
    ChimeraX-Mask: 1.0
    ChimeraX-MatchMaker: 1.2.1
    ChimeraX-MDcrds: 2.2
    ChimeraX-MedicalToolbar: 1.0.1
    ChimeraX-Meeting: 1.0
    ChimeraX-MLP: 1.1
    ChimeraX-mmCIF: 2.3
    ChimeraX-MMTF: 2.1
    ChimeraX-Modeller: 1.0.1
    ChimeraX-ModelPanel: 1.0.1
    ChimeraX-ModelSeries: 1.0
    ChimeraX-Mol2: 2.0
    ChimeraX-Morph: 1.0
    ChimeraX-MouseModes: 1.1
    ChimeraX-Movie: 1.0
    ChimeraX-Neuron: 1.0
    ChimeraX-Nucleotides: 2.0.1
    ChimeraX-OpenCommand: 1.5
    ChimeraX-PDB: 2.4.1
    ChimeraX-PDBBio: 1.0
    ChimeraX-PDBLibrary: 1.0.1
    ChimeraX-PDBMatrices: 1.0
    ChimeraX-PickBlobs: 1.0
    ChimeraX-Positions: 1.0
    ChimeraX-PresetMgr: 1.0.1
    ChimeraX-PubChem: 2.0.1
    ChimeraX-ReadPbonds: 1.0
    ChimeraX-Registration: 1.1
    ChimeraX-RemoteControl: 1.0
    ChimeraX-ResidueFit: 1.0
    ChimeraX-RestServer: 1.1
    ChimeraX-RNALayout: 1.0
    ChimeraX-RotamerLibMgr: 2.0
    ChimeraX-RotamerLibsDunbrack: 2.0
    ChimeraX-RotamerLibsDynameomics: 2.0
    ChimeraX-RotamerLibsRichardson: 2.0
    ChimeraX-SaveCommand: 1.4
    ChimeraX-SchemeMgr: 1.0
    ChimeraX-SDF: 2.0
    ChimeraX-Segger: 1.0
    ChimeraX-Segment: 1.0
    ChimeraX-SeqView: 2.3
    ChimeraX-Shape: 1.0.1
    ChimeraX-Shell: 1.0
    ChimeraX-Shortcuts: 1.0
    ChimeraX-ShowAttr: 1.0
    ChimeraX-ShowSequences: 1.0
    ChimeraX-SideView: 1.0
    ChimeraX-Smiles: 2.0.1
    ChimeraX-SmoothLines: 1.0
    ChimeraX-SpaceNavigator: 1.0
    ChimeraX-StdCommands: 1.3.1
    ChimeraX-STL: 1.0
    ChimeraX-Storm: 1.0
    ChimeraX-Struts: 1.0
    ChimeraX-Surface: 1.0
    ChimeraX-SwapAA: 2.0
    ChimeraX-SwapRes: 2.1
    ChimeraX-TapeMeasure: 1.0
    ChimeraX-Test: 1.0
    ChimeraX-Toolbar: 1.0.1
    ChimeraX-ToolshedUtils: 1.2
    ChimeraX-Tug: 1.0
    ChimeraX-UI: 1.7.6
    ChimeraX-uniprot: 2.1
    ChimeraX-UnitCell: 1.0
    ChimeraX-ViewDockX: 1.0
    ChimeraX-Vive: 1.1
    ChimeraX-VolumeMenu: 1.0
    ChimeraX-VTK: 1.0
    ChimeraX-WavefrontOBJ: 1.0
    ChimeraX-WebCam: 1.0
    ChimeraX-WebServices: 1.0
    ChimeraX-Zone: 1.0
    colorama: 0.4.3
    comtypes: 1.1.7
    cxservices: 1.0
    cycler: 0.10.0
    Cython: 0.29.21
    decorator: 5.0.9
    distlib: 0.3.1
    docutils: 0.16
    filelock: 3.0.12
    funcparserlib: 0.3.6
    grako: 3.16.5
    h5py: 2.10.0
    html2text: 2020.1.16
    idna: 2.10
    ihm: 0.17
    imagecodecs: 2020.5.30
    imagesize: 1.2.0
    ipykernel: 5.3.4
    ipython: 7.18.1
    ipython-genutils: 0.2.0
    jedi: 0.17.2
    Jinja2: 2.11.2
    jupyter-client: 6.1.7
    jupyter-core: 4.7.1
    kiwisolver: 1.3.1
    line-profiler: 2.1.2
    lxml: 4.6.2
    lz4: 3.1.0
    MarkupSafe: 2.0.1
    matplotlib: 3.3.2
    matplotlib-inline: 0.1.2
    msgpack: 1.0.0
    netCDF4: 1.5.4
    networkx: 2.5
    numexpr: 2.7.3
    numpy: 1.19.2
    numpydoc: 1.1.0
    openvr: 1.14.1501
    packaging: 20.9
    ParmEd: 3.2.0
    parso: 0.7.1
    pexpect: 4.8.0
    pickleshare: 0.7.5
    Pillow: 7.2.0
    pip: 21.0.1
    pkginfo: 1.5.0.1
    prompt-toolkit: 3.0.18
    psutil: 5.7.2
    ptyprocess: 0.7.0
    pycollada: 0.7.1
    pydicom: 2.0.0
    Pygments: 2.7.1
    PyOpenGL: 3.1.5
    PyOpenGL-accelerate: 3.1.5
    pyparsing: 2.4.7
    PyQt5-commercial: 5.15.2
    PyQt5-sip: 12.8.1
    PyQtWebEngine-commercial: 5.15.2
    python-dateutil: 2.8.1
    pytz: 2021.1
    pyzmq: 22.0.3
    qtconsole: 4.7.7
    QtPy: 1.9.0
    RandomWords: 0.3.0
    requests: 2.24.0
    scipy: 1.5.2
    setuptools: 50.3.2
    sfftk-rw: 0.6.7.dev1
    six: 1.15.0
    snowballstemmer: 2.1.0
    sortedcontainers: 2.2.2
    Sphinx: 3.2.1
    sphinxcontrib-applehelp: 1.0.2
    sphinxcontrib-blockdiag: 2.0.0
    sphinxcontrib-devhelp: 1.0.2
    sphinxcontrib-htmlhelp: 2.0.0
    sphinxcontrib-jsmath: 1.0.1
    sphinxcontrib-qthelp: 1.0.3
    sphinxcontrib-serializinghtml: 1.1.5
    suds-jurko: 0.6
    tables: 3.6.1
    tifffile: 2020.9.3
    tinyarray: 1.2.3
    tornado: 6.1
    traitlets: 5.0.5
    urllib3: 1.25.11
    wcwidth: 0.2.5
    webcolors: 1.11.1
    wheel: 0.36.0
    wheel-filename: 1.3.0

[pett]

Hi Marek,

Thanks for reporting this problem. Can you restore hSSB1-dT35_labelled_Ys.cx in a newly started ChimeraX? If you open 4OWX and show the sequence of chain B, does restoring that session fail every time?

--Eric

Eric Pettersen
UCSF Computer Graphics Lab