'ModelMenuButton' does not have a signal with the signature value_changed()

[chimerax-bug-report@…]

The following bug report has been submitted:
Platform:        Windows-10-10.0.19042
ChimeraX Version: 1.3.dev202109080319 (2021-09-08 03:19:35 UTC)
Description
(Describe the actions that caused this problem to occur here)

Log:
UCSF ChimeraX version: 1.3.dev202109080319 (2021-09-08)  
© 2016-2021 Regents of the University of California. All rights reserved.  

> open
> "C:/Users/nxb318/Documents/EM_related/rGluK2-3m-domoic_acid_processing/P5j200/Coot/Figures
> for AHA/P5-J385_rGluK2-3m-domo_3.59A.cxs"

Opened cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc as #2, grid
size 480,480,480, pixel 1.06, shown at level 5.56, step 1, values float32  
Opened cryosparc_P5_J385_007_volume_map_zflipped.mrc as #3, grid size
480,480,480, pixel 1.06, shown at level 0.147, step 1, values float32  
Opened cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc gaussian as #6,
grid size 480,480,480, pixel 1.06, shown at level 1.36, step 1, values float32  
Log from Wed Sep 8 19:44:04 2021UCSF ChimeraX version: 1.3.dev202109080319
(2021-09-08)  
© 2016-2021 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open
> C:/Users/nxb318/Documents/EM_related/rGluK2-3m-domoic_acid_processing/cryosparc_P5_J385_007_volume_sharpened_map.ccp4

Opened cryosparc_P5_J385_007_volume_sharpened_map.ccp4 as #1, grid size
480,480,480, pixel 1.06, shown at level 2.41, step 2, values float32  

> volume #1 level 5.267

> volume #1 step 1

> lighting soft

> volume #1 level 7.142

> ui tool show "Hide Dust"

> surface dust #1 size 6.36

> volume #1 level 7.8

> volume #1 level 7.1

> volume #1 level 7

> volume #1 level 6.9

> vop zflip #0

> volume zflip #0

Expected a density maps specifier or a keyword  

> vop zflip #1

> volume zflip #1

Expected a density maps specifier or a keyword  

> volume #1 level 5.561

> volume planes z style image imageMode "full region"

> mousemode rightMode "move planes"

> volume planes z style image imageMode "full region"

> mousemode rightMode "move planes"

> volume show

> volume #1 region 0,0,214,479,479,214

> volume #1 style image region all imageMode "tilted slab" tiltedSlabAxis
> 0,0,1 tiltedSlabOffset 254.4 tiltedSlabSpacing 1.06 tiltedSlabPlaneCount 10

> mousemode rightMode "rotate slab"

> volume #1 orthoplanes xyz positionPlanes 240,240,240 style image region all

> mousemode rightMode "move planes"

> volume region all imageMode "full region"

> volume unzone

> mousemode rightMode "crop volume"

> volume region all imageMode "full region"

> volume unzone

> mousemode rightMode "crop volume"

> volume style surface

> volume zflip #1

Expected a density maps specifier or a keyword  

> volume zflip #1

Expected a density maps specifier or a keyword  

> color #1 #ff5500 models

> color #1 red models

> color #1 #ff557f models

> color #1 cyan models

> color #1 white models

> color #1 #55ff7f models

> color #1 #55ffff models

> color #1 #ffff7f models

> color #1 #a2bcc8 models

> color #1 #93c8b2 models

> color #1 #3f7ac8 models

> color #1 #868686 models

> color #1 #939393 models

> volume #1 region 0,0,0,479,479,479

> ui tool show "Hide Dust"

> volume #1 region 0,0,0,479,479,479

[Repeated 1 time(s)]

> surface dust #1 size 10.6

> volume #1 region 1,0,0,479,479,479

> movie record

> turn y 2 180

> wait 180

> movie encode C:\Users\nxb318\Desktop\movie1.mp4

Movie saved to \C:Users\\...\Desktop\movie1.mp4  
  

> movie record

> turn y 2 180

> wait 180

> movie encode C:\Users\nxb318\Desktop\movie2.mp4

Movie saved to \C:Users\\...\Desktop\movie2.mp4  
  

> vop zflip #1

> volume zflip #1

Expected a density maps specifier or a keyword  

> select #1

3 models selected  

> vop zflip #1

> volume zflip #1

Expected a density maps specifier or a keyword  

> select clear

> hide #1.1 models

> show #1.2 models

> show #1.1 models

> hide #1.1 models

> hide #1.2 models

> show #1.1 models

> vop zflip #1.1

> volume zflip #1.1

Expected a density maps specifier or a keyword  

> vop z-flip #1.1

> volume z-flip #1.1

Expected a density maps specifier or a keyword  

> vop #1 zflip

> volume #1 zflip

Expected a keyword  

> volume show

> volume hide

> volume show

> volume hide

> open
> C:/Users/nxb318/Documents/EM_related/rGluK2-3m-domoic_acid_processing/cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc

Opened cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc as #2, grid
size 480,480,480, pixel 1.06, shown at level 2.4, step 2, values float32  

> hide #1.1 models

> volume #1 change image level -1.042,0 level 4.803,0.8 level 23.25,1

> volume #2 level 5.56

> surface dust #2 size 10.6

> volume #2 step 1

> open
> C:/Users/nxb318/Documents/EM_related/rGluK2-3m-domoic_acid_processing/cryosparc_P5_J385_007_volume_map.mrc

Opened cryosparc_P5_J385_007_volume_map.mrc as #3, grid size 480,480,480,
pixel 1.06, shown at level 0.0349, step 2, values float32  

> volume #3 step 1

> close #3

> open
> C:/Users/nxb318/Documents/EM_related/rGluK2-3m-domoic_acid_processing/cryosparc_P5_J385_007_volume_map.mrc

Opened cryosparc_P5_J385_007_volume_map.mrc as #3, grid size 480,480,480,
pixel 1.06, shown at level 0.0349, step 2, values float32  

> close #3

> open
> C:/Users/nxb318/Documents/EM_related/rGluK2-3m-domoic_acid_processing/cryosparc_P5_J385_007_volume_map_zflipped.mrc

Opened cryosparc_P5_J385_007_volume_map_zflipped.mrc as #3, grid size
480,480,480, pixel 1.06, shown at level 0.0348, step 2, values float32  

> volume #3 step 1

> volume #3 level 0.08037

> volume #2 region 0,0,0,479,479,467

[Repeated 1 time(s)]

> volume #3 level 5.56

> volume #3 level 0.1466

> help help:user

> open 5kuf

Summary of feedback from opening 5kuf fetched from pdb  
---  
notes | Fetching compressed mmCIF 5kuf from
http://files.rcsb.org/download/5kuf.cif  
Fetching CCD SYM from http://ligand-expo.rcsb.org/reports/S/SYM/SYM.cif  
  
5kuf title:  
GluK2EM with 2S,4R-4-methylglutamate [more info...]  
  
Chain information for 5kuf #4  
---  
Chain | Description | UniProt  
A B C D | Glutamate receptor ionotropic, kainate 2 | GRIK2_RAT  
  
Non-standard residues in 5kuf #4  
---  
SYM — 2S,4R-4-methylglutamate  
  

> hide #1.1 models

> hide #!2 models

> show #!2 models

> select /A:370

9 atoms, 8 bonds, 1 residue, 1 model selected  
Drag select of 21 residues  

> volume #2 region 0,0,0,478,479,467

> volume #2 region 0,0,0,474,479,467

> volume #2 region 0,0,0,456,479,467

> ui mousemode right "translate selected models"

> view matrix models #4,1,0,0,-9.9599,0,1,0,25.572,0,0,1,61.54

> view matrix models #4,1,0,0,52.74,0,1,0,67.277,0,0,1,66.063

> ui mousemode right "rotate selected models"

Drag select of 3 residues  

> view matrix models
> #4,0.83694,0.54294,-0.068902,-9.2403,-0.5448,0.83851,-0.010168,209.53,0.052254,0.046048,0.99757,47.015

> ui mousemode right "translate selected models"

> view matrix models
> #4,0.83694,0.54294,-0.068902,-4.4407,-0.5448,0.83851,-0.010168,201.45,0.052254,0.046048,0.99757,48.163

> ui tool show "Fit in Map"

Fit molecule 5kuf (#4) to map
cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc (#2) using 23728 atoms  
average map value = 5.03, steps = 104  
shifted from previous position = 2.28  
rotated from previous position = 2.89 degrees  
atoms outside contour = 15337, contour level = 5.56  
  
Position of 5kuf (#4) relative to
cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc (#2) coordinates:  
Matrix rotation and translation  
0.81834634 0.57374561 -0.03354465 -15.01919702  
-0.57427503 0.81862123 -0.00821396 210.41724343  
0.02274764 0.02598572 0.99940347 55.44296628  
Axis 0.02974121 -0.04895372 -0.99835815  
Axis point 321.44124146 124.52260959 0.00000000  
Rotation angle (degrees) 35.09643229  
Shift along axis -66.09933216  
  

> volume #3

> volume #2 style mesh

> volume #2 style surface

> view #2.1 clip false

[Repeated 1 time(s)]

> volume #2 level 5.56

> view matrix models
> #4,0.81835,0.57375,-0.033545,-14.591,-0.57428,0.81862,-0.008214,211.42,0.022748,0.025986,0.9994,59.468

> ui tool show "Fit in Map"

Fit molecule 5kuf (#4) to map
cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc (#2) using 23728 atoms  
average map value = 11.66, steps = 76  
shifted from previous position = 3.12  
rotated from previous position = 2.46 degrees  
atoms outside contour = 9425, contour level = 5.56  
  
Position of 5kuf (#4) relative to
cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc (#2) coordinates:  
Matrix rotation and translation  
0.79311848 0.60790582 -0.03759762 -14.65183560  
-0.60840253 0.79362532 -0.00228300 218.98966984  
0.02845057 0.02468518 0.99929035 59.39430502  
Axis 0.02213412 -0.05420901 -0.99828426  
Axis point 310.44270985 127.14859668 0.00000000  
Rotation angle (degrees) 37.53163721  
Shift along axis -71.48791787  
  

> transparency #2.1 50

> volume #!2 style surface

> transparency #2.1 0

> hide #!4 models

> lighting full

> set bgColor white

> set bgColor black

> lighting soft

> open
> C:/Users/nxb318/Documents/EM_related/rGluK2-3m-domoic_acid_processing/P5j200/Coot/5kuf_G2-domo_J303_nolig.pdb

Chain information for 5kuf_G2-domo_J303_nolig.pdb #5  
---  
Chain | Description  
A B C D | No description available  
  
Fit molecule 5kuf_G2-domo_J303_nolig.pdb (#5) to map
cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc (#2) using 23684 atoms  
average map value = 4.956, steps = 224  
shifted from previous position = 14  
rotated from previous position = 2.49 degrees  
atoms outside contour = 15739, contour level = 5.56  
  
Position of 5kuf_G2-domo_J303_nolig.pdb (#5) relative to
cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc (#2) coordinates:  
Matrix rotation and translation  
0.99913221 -0.04164313 0.00081770 4.60193938  
0.04163010 0.99905882 0.01218196 -18.33962503  
-0.00132422 -0.01213735 0.99992546 -8.33191414  
Axis -0.28024687 0.02468270 0.95961058  
Axis point 435.57565639 35.89981714 0.00000000  
Rotation angle (degrees) 2.48679168  
Shift along axis -9.73774340  
  

> volume gaussian #2 sDev 2

Opened cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc gaussian as #6,
grid size 480,480,480, pixel 1.06, shown at step 1, values float32  

> close #1

> volume #6 level 1.357

Fit molecule 5kuf_G2-domo_J303_nolig.pdb (#5) to map
cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc gaussian (#6) using
23684 atoms  
average map value = 5.409, steps = 96  
shifted from previous position = 5.2  
rotated from previous position = 1.29 degrees  
atoms outside contour = 118, contour level = 1.3566  
  
Position of 5kuf_G2-domo_J303_nolig.pdb (#5) relative to
cryosparc_P5_J385_007_volume_sharpened_map_zflipped.mrc gaussian (#6)
coordinates:  
Matrix rotation and translation  
0.99900048 -0.03944106 -0.02103425 7.93233905  
0.03980617 0.99905883 0.01723131 -22.99085838  
0.02033483 -0.01805138 0.99963025 -15.03881901  
Axis -0.36712213 -0.43045192 0.82458019  
Axis point 639.32149745 134.50067833 0.00000000  
Rotation angle (degrees) 2.75429920  
Shift along axis -5.41639019  
  

> hide #!5 models

> save
> "C:/Users/nxb318/Documents/EM_related/rGluK2-3m-domoic_acid_processing/P5j200/Coot/Figures
> for AHA/rGluK2-3m-domo_s2c2_P5_385.png" width 2148 height 1194 supersample 4
> transparentBackground true

> save
> "C:/Users/nxb318/Documents/EM_related/rGluK2-3m-domoic_acid_processing/P5j200/Coot/Figures
> for AHA/rGluK2-3m-domo_s2c2_P5_385a.png" width 2148 height 1194 supersample
> 4

> save
> "C:/Users/nxb318/Documents/EM_related/rGluK2-3m-domoic_acid_processing/P5j200/Coot/Figures
> for AHA/P5-J385_rGluK2-3m-domo_3.59A.cxs" includeMaps true

——— End of log from Wed Sep 8 19:44:04 2021 ———

opened ChimeraX session  
AttributeError: 'ModelMenuButton' does not have a signal with the signature
value_changed()  
  
AttributeError: 'ModelMenuButton' does not have a signal with the signature
value_changed()  
  
  
See log for complete Python traceback.  
  




OpenGL version: 3.3.0 NVIDIA 466.79
OpenGL renderer: NVIDIA GeForce RTX 2080/PCIe/SSE2
OpenGL vendor: NVIDIA Corporation
Manufacturer: Dell Inc.
Model: OptiPlex 7071
OS: Microsoft Windows 10 Pro (Build 19042)
Memory: 34,140,291,072
MaxProcessMemory: 137,438,953,344
CPU: 8 Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz
OSLanguage: en-US
Locale: ('en_US', 'cp1252')
PyQt5 5.15.2, Qt 5.15.2
Installed Packages:
    alabaster: 0.7.12
    appdirs: 1.4.4
    Babel: 2.9.1
    backcall: 0.2.0
    blockdiag: 2.0.1
    certifi: 2021.5.30
    cftime: 1.5.0
    chardet: 4.0.0
    ChimeraX-AddCharge: 1.1.4
    ChimeraX-AddH: 2.1.10
    ChimeraX-AlignmentAlgorithms: 2.0
    ChimeraX-AlignmentHdrs: 3.2
    ChimeraX-AlignmentMatrices: 2.0
    ChimeraX-Alignments: 2.2.2
    ChimeraX-AlphaFold: 1.0
    ChimeraX-AltlocExplorer: 1.0.1
    ChimeraX-AmberInfo: 1.0
    ChimeraX-Arrays: 1.0
    ChimeraX-Atomic: 1.29.1
    ChimeraX-AtomicLibrary: 4.1.4
    ChimeraX-AtomSearch: 2.0
    ChimeraX-AtomSearchLibrary: 1.0
    ChimeraX-AxesPlanes: 2.0
    ChimeraX-BasicActions: 1.1
    ChimeraX-BILD: 1.0
    ChimeraX-BlastProtein: 2.0
    ChimeraX-BondRot: 2.0
    ChimeraX-BugReporter: 1.0
    ChimeraX-BuildStructure: 2.5.3
    ChimeraX-Bumps: 1.0
    ChimeraX-BundleBuilder: 1.1
    ChimeraX-ButtonPanel: 1.0
    ChimeraX-CageBuilder: 1.0
    ChimeraX-CellPack: 1.0
    ChimeraX-Centroids: 1.2
    ChimeraX-ChemGroup: 2.0
    ChimeraX-Clashes: 2.1
    ChimeraX-ColorActions: 1.0
    ChimeraX-ColorGlobe: 1.0
    ChimeraX-ColorKey: 1.4.1
    ChimeraX-CommandLine: 1.1.5
    ChimeraX-ConnectStructure: 2.0
    ChimeraX-Contacts: 1.0
    ChimeraX-Core: 1.3.dev202109080319
    ChimeraX-CoreFormats: 1.1
    ChimeraX-coulombic: 1.3.1
    ChimeraX-Crosslinks: 1.0
    ChimeraX-Crystal: 1.0
    ChimeraX-CrystalContacts: 1.0
    ChimeraX-DataFormats: 1.2.1
    ChimeraX-Dicom: 1.0
    ChimeraX-DistMonitor: 1.1.4
    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: 1.1
    ChimeraX-Hbonds: 2.1.1
    ChimeraX-Help: 1.2
    ChimeraX-HKCage: 1.3
    ChimeraX-IHM: 1.1
    ChimeraX-ImageFormats: 1.2
    ChimeraX-IMOD: 1.0
    ChimeraX-IO: 1.0.1
    ChimeraX-ItemsInspection: 1.0
    ChimeraX-Label: 1.1
    ChimeraX-ListInfo: 1.1.1
    ChimeraX-Log: 1.1.4
    ChimeraX-LookingGlass: 1.1
    ChimeraX-Maestro: 1.8.1
    ChimeraX-Map: 1.1
    ChimeraX-MapData: 2.0
    ChimeraX-MapEraser: 1.0
    ChimeraX-MapFilter: 2.0
    ChimeraX-MapFit: 2.0
    ChimeraX-MapSeries: 2.1
    ChimeraX-Markers: 1.0
    ChimeraX-Mask: 1.0
    ChimeraX-MatchMaker: 2.0.1
    ChimeraX-MDcrds: 2.5
    ChimeraX-MedicalToolbar: 1.0.1
    ChimeraX-Meeting: 1.0
    ChimeraX-MLP: 1.1
    ChimeraX-mmCIF: 2.4
    ChimeraX-MMTF: 2.1
    ChimeraX-Modeller: 1.1.1
    ChimeraX-ModelPanel: 1.1
    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: 2.0.2
    ChimeraX-OpenCommand: 1.7
    ChimeraX-PDB: 2.6.1
    ChimeraX-PDBBio: 1.0
    ChimeraX-PDBLibrary: 1.0.1
    ChimeraX-PDBMatrices: 1.0
    ChimeraX-Phenix: 0.3
    ChimeraX-PickBlobs: 1.0
    ChimeraX-Positions: 1.0
    ChimeraX-PresetMgr: 1.0.1
    ChimeraX-PubChem: 2.1
    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: 1.5
    ChimeraX-SchemeMgr: 1.0
    ChimeraX-SDF: 2.0
    ChimeraX-Segger: 1.0
    ChimeraX-Segment: 1.0
    ChimeraX-SelInspector: 1.0
    ChimeraX-SeqView: 2.4.3
    ChimeraX-Shape: 1.0.1
    ChimeraX-Shell: 1.0
    ChimeraX-Shortcuts: 1.1
    ChimeraX-ShowAttr: 1.0
    ChimeraX-ShowSequences: 1.0
    ChimeraX-SideView: 1.0
    ChimeraX-Smiles: 2.1
    ChimeraX-SmoothLines: 1.0
    ChimeraX-SpaceNavigator: 1.0
    ChimeraX-StdCommands: 1.6
    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: 1.1
    ChimeraX-ToolshedUtils: 1.2
    ChimeraX-Tug: 1.0
    ChimeraX-UI: 1.12
    ChimeraX-uniprot: 2.2
    ChimeraX-UnitCell: 1.0
    ChimeraX-ViewDockX: 1.0.1
    ChimeraX-VIPERdb: 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: 0.4.4
    comtypes: 1.1.10
    cxservices: 1.1
    cycler: 0.10.0
    Cython: 0.29.23
    decorator: 5.0.9
    distlib: 0.3.1
    docutils: 0.17.1
    filelock: 3.0.12
    funcparserlib: 0.3.6
    grako: 3.16.5
    h5py: 3.4.0
    html2text: 2020.1.16
    idna: 2.10
    ihm: 0.20
    imagecodecs: 2021.4.28
    imagesize: 1.2.0
    ipykernel: 5.5.5
    ipython: 7.23.1
    ipython-genutils: 0.2.0
    jedi: 0.18.0
    Jinja2: 2.11.3
    jupyter-client: 6.1.12
    jupyter-core: 4.7.1
    kiwisolver: 1.3.2
    lxml: 4.6.3
    lz4: 3.1.3
    MarkupSafe: 1.1.1
    matplotlib: 3.4.2
    matplotlib-inline: 0.1.3
    msgpack: 1.0.2
    netCDF4: 1.5.6
    networkx: 2.6.2
    numexpr: 2.7.3
    numpy: 1.21.0
    openvr: 1.16.801
    packaging: 21.0
    ParmEd: 3.2.0
    parso: 0.8.2
    pickleshare: 0.7.5
    Pillow: 8.2.0
    pip: 21.1.1
    pkginfo: 1.7.0
    prompt-toolkit: 3.0.20
    psutil: 5.8.0
    pycollada: 0.7.1
    pydicom: 2.1.2
    Pygments: 2.9.0
    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
    pywin32: 228
    pyzmq: 22.2.1
    qtconsole: 5.1.0
    QtPy: 1.11.0
    RandomWords: 0.3.0
    requests: 2.25.1
    scipy: 1.6.3
    setuptools: 57.0.0
    sfftk-rw: 0.7.1
    six: 1.16.0
    snowballstemmer: 2.1.0
    sortedcontainers: 2.4.0
    Sphinx: 4.0.1
    sphinx-autodoc-typehints: 1.12.0
    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: 2021.4.8
    tinyarray: 1.2.3
    tornado: 6.1
    traitlets: 5.1.0
    urllib3: 1.26.6
    wcwidth: 0.2.5
    webcolors: 1.11.1
    wheel: 0.36.2
    wheel-filename: 1.3.0
    WMI: 1.5.1

[Eric Pettersen]

Happened immediately after opening a session. No idea how this is possible, since ModelMenuButton inherits from ItemMenuButton, which has value_changed as a class variable.