The following bug report has been submitted:
Platform: macOS-15.7.7-arm64-arm-64bit
ChimeraX Version: 1.13.dev202605192122 (2026-05-19 21:22:40 UTC)
Description
msa3d /A
Log:
UCSF ChimeraX version: 1.13.dev202605192122 (2026-05-19)
© 2016-2026 Regents of the University of California. All rights reserved.
How to cite UCSF ChimeraX
> open 2mnr 1muc
2mnr title:
Mechanism of the reaction catalyzed by mandelate racemase. 2. Crystal
structure of mandelate racemase At 2.5 angstroms resolution: identification of
the active site and possible catalytic residues [more info...]
Chain information for 2mnr #1
---
Chain | Description | UniProt
A | MANDELATE RACEMASE | MANR_PSEPU 3-359
Non-standard residues in 2mnr #1
---
MN — manganese (II) ion
SO4 — sulfate ion
2mnr mmCIF Assemblies
---
1| author_and_software_defined_assembly
1muc title:
Structure of muconate lactonizing enzyme At 1.85 angstroms resolution [more
info...]
Chain information for 1muc #2
---
Chain | Description | UniProt
A B | MUCONATE LACTONIZING ENZYME | CATB_PSEPU 1-373
Non-standard residues in 1muc #2
---
MN — manganese (II) ion
1muc mmCIF Assemblies
---
1| author_and_software_defined_assembly
> mmaker #1 to #2
Parameters
---
Chain pairing | bb
Alignment algorithm | Needleman-Wunsch
Similarity matrix | BLOSUM-62
SS fraction | 0.3
Gap open (HH/SS/other) | 18/18/6
Gap extend | 1
SS matrix | | | H | S | O
---|---|---|---
H | 6 | -9 | -6
S | | 6 | -6
O | | | 4
Iteration cutoff | 2
Matchmaker 1muc, chain A (#2) with 2mnr, chain A (#1), sequence alignment
score = 549.1
RMSD between 202 pruned atom pairs is 1.107 angstroms; (across all 340 pairs:
3.634)
> msa3d /A
Match→Align cutoff: 5.0, in column if within cutoff of: any
332 residue pairs aligned
357 fully populated columns
Traceback (most recent call last):
File
"/Users/pett/src/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/cmd_line/tool.py", line 322, in execute
cmd.run(cmd_text)
File
"/Users/pett/src/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/core/commands/cli.py", line 3245, in run
result = ci.function(session, **kw_args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/pett/src/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/match_align/cmd.py", line 155, in make_alignment
coords[seq] = column_atoms(seq, full_cols).scene_coords
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/pett/src/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/match_align/cmd.py", line 247, in column_atoms
return Atoms([r.principal_atom for r in [residues[i] for i in seq_columns]])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/pett/src/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/match_align/cmd.py", line 247, in <listcomp>
return Atoms([r.principal_atom for r in [residues[i] for i in seq_columns]])
^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'principal_atom'
AttributeError: 'NoneType' object has no attribute 'principal_atom'
File
"/Users/pett/src/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/match_align/cmd.py", line 247, in
return Atoms([r.principal_atom for r in [residues[i] for i in seq_columns]])
^^^^^^^^^^^^^^^^
See log for complete Python traceback.
OpenGL version: 4.1 Metal - 89.4
OpenGL renderer: Apple M3
OpenGL vendor: Apple
Python: 3.11.9
Locale: en_US.UTF-8
Qt version: PyQt6 6.10.2, Qt 6.10.0
Qt runtime version: 6.10.1
Qt platform: cocoa
Hardware:
Hardware Overview:
Model Name: iMac
Model Identifier: Mac15,5
Model Number: Z19K0011DLL/A
Chip: Apple M3
Total Number of Cores: 8 (4 performance and 4 efficiency)
Memory: 16 GB
System Firmware Version: mBoot-18000.120.36
OS Loader Version: 11881.140.96.701.1
Software:
System Software Overview:
System Version: macOS 15.7.7 (24G720)
Kernel Version: Darwin 24.6.0
Time since boot: 3 hours, 48 minutes
Graphics/Displays:
Apple M3:
Chipset Model: Apple M3
Type: GPU
Bus: Built-In
Total Number of Cores: 10
Vendor: Apple (0x106b)
Metal Support: Metal 3
Displays:
iMac:
Display Type: Built-In Retina LCD
Resolution: Retina 4.5K (4480 x 2520)
Main Display: Yes
Mirror: Off
Online: Yes
Automatically Adjust Brightness: Yes
Connection Type: Internal
Installed Packages:
accessible-pygments: 0.0.5
aiohappyeyeballs: 2.6.1
aiohttp: 3.13.1
aiosignal: 1.4.0
alabaster: 1.0.0
annotated-types: 0.7.0
anyio: 4.12.1
appdirs: 1.4.4
appnope: 0.1.4
asttokens: 3.0.1
attrs: 25.4.0
babel: 2.18.0
beautifulsoup4: 4.13.5
blockdiag: 3.0.0
blosc2: 4.0.0
build: 1.3.0
certifi: 2025.8.3
cftime: 1.6.5
charset-normalizer: 3.4.4
ChimeraX-AddCharge: 1.5.20
ChimeraX-AddH: 2.2.8
ChimeraX-AlignmentAlgorithms: 2.0.2
ChimeraX-AlignmentHdrs: 3.6.2
ChimeraX-AlignmentMatrices: 2.1
ChimeraX-Alignments: 3.2
ChimeraX-AlphaFold: 1.0.1
ChimeraX-AltlocExplorer: 1.2
ChimeraX-AmberInfo: 1.0
ChimeraX-Animations: 1.0
ChimeraX-Aniso: 1.3.2
ChimeraX-Arrays: 1.1
ChimeraX-Atomic: 1.69.1
ChimeraX-AtomicLibrary: 14.4
ChimeraX-AtomSearch: 2.0.1
ChimeraX-AxesPlanes: 2.4
ChimeraX-BasicActions: 1.1.3
ChimeraX-BILD: 1.0
ChimeraX-BlastProtein: 3.0.0
ChimeraX-Boltz: 1.1
ChimeraX-BondRot: 2.0.4
ChimeraX-BugReporter: 1.0.2
ChimeraX-BuildStructure: 2.13.1
ChimeraX-Bumps: 1.0
ChimeraX-BundleBuilder: 1.6.0
ChimeraX-ButtonPanel: 1.0.1
ChimeraX-CageBuilder: 1.0.1
ChimeraX-CellPack: 1.0
ChimeraX-Centroids: 1.4.1
ChimeraX-ChangeChains: 1.1
ChimeraX-CheckWaters: 1.5
ChimeraX-ChemGroup: 2.0.2
ChimeraX-Clashes: 2.3.1
ChimeraX-Cluster: 1.0
ChimeraX-ColorActions: 1.0.5
ChimeraX-ColorGlobe: 1.0
ChimeraX-ColorKey: 1.5.8
ChimeraX-CommandLine: 1.3.1
ChimeraX-ConnectStructure: 2.0.1
ChimeraX-Contacts: 1.0.1
ChimeraX-Core: 1.13.dev202605192122
ChimeraX-CoreFormats: 1.2
ChimeraX-coulombic: 1.4.5
ChimeraX-Crosslinks: 1.0
ChimeraX-Crystal: 1.0
ChimeraX-CrystalContacts: 1.0.1
ChimeraX-DataFormats: 1.2.4
ChimeraX-Dicom: 1.2.7
ChimeraX-DistMonitor: 1.4.2
ChimeraX-DockPrep: 1.2
ChimeraX-Dssp: 2.0
ChimeraX-EMDB-SFF: 1.0
ChimeraX-ESMFold: 1.0
ChimeraX-FileHistory: 1.0.1
ChimeraX-FunctionKey: 1.0.1
ChimeraX-Geometry: 1.3
ChimeraX-gltf: 1.0
ChimeraX-Graphics: 1.4.1
ChimeraX-Hbonds: 2.5.3
ChimeraX-Help: 1.3
ChimeraX-HKCage: 1.3
ChimeraX-IHM: 1.1
ChimeraX-ImageFormats: 1.2
ChimeraX-IMOD: 1.0
ChimeraX-IO: 1.0.4
ChimeraX-ItemsInspection: 1.0.1
ChimeraX-IUPAC: 1.0
ChimeraX-KVFinder: 1.8.2
ChimeraX-Label: 1.4
ChimeraX-LightingGUI: 1.0
ChimeraX-ListInfo: 1.3.1
ChimeraX-Log: 1.2.2
ChimeraX-LookingGlass: 1.1
ChimeraX-Maestro: 1.9.2
ChimeraX-Map: 1.3
ChimeraX-MapData: 2.0
ChimeraX-MapEraser: 1.0.1
ChimeraX-MapFilter: 2.0.1
ChimeraX-MapFit: 2.0
ChimeraX-MapSeries: 2.1.1
ChimeraX-Markers: 1.0.1
ChimeraX-Mask: 1.0.2
ChimeraX-MatchAlign: 1.1
ChimeraX-MatchMaker: 2.4
ChimeraX-MCopy: 1.0
ChimeraX-MCPServer: 0.2.0
ChimeraX-MDcrds: 2.19
ChimeraX-MedicalToolbar: 1.1
ChimeraX-Meeting: 1.0.1
ChimeraX-Minimize: 1.3.8
ChimeraX-MLP: 1.1.1
ChimeraX-mmCIF: 2.16
ChimeraX-MMTF: 2.2
ChimeraX-ModelArchive: 1.0
ChimeraX-Modeller: 1.5.23
ChimeraX-ModelPanel: 1.6.1
ChimeraX-ModelSeries: 1.0.1
ChimeraX-Mol2: 2.0.3
ChimeraX-Mole: 1.0
ChimeraX-Morph: 1.0.2
ChimeraX-MouseModes: 1.2
ChimeraX-Movie: 1.0.1
ChimeraX-MutationScores: 1.0
ChimeraX-Neuron: 1.0
ChimeraX-Nifti: 1.2
ChimeraX-NMRSTAR: 1.0.2
ChimeraX-NRRD: 1.2
ChimeraX-Nucleotides: 2.0.3
ChimeraX-OpenCommand: 1.16
ChimeraX-OrthoPick: 1.0.1
ChimeraX-PDB: 2.7.12
ChimeraX-PDBBio: 1.0.1
ChimeraX-PDBLibrary: 1.0.5
ChimeraX-PDBMatrices: 1.0
ChimeraX-PhenixUI: 1.6.1
ChimeraX-PickBlobs: 1.0.1
ChimeraX-Positions: 1.0
ChimeraX-PresetMgr: 1.1.4
ChimeraX-ProfileGrids: 1.8
ChimeraX-ProNA3D: 0.1
ChimeraX-PubChem: 2.2
ChimeraX-ReadPbonds: 1.0.1
ChimeraX-Registration: 1.1.2
ChimeraX-RemoteControl: 1.0
ChimeraX-RenderByAttr: 1.8.1
ChimeraX-RenumberResidues: 1.1
ChimeraX-ResidueFit: 1.0.1
ChimeraX-RestServer: 1.3.3
ChimeraX-RNALayout: 1.0
ChimeraX-RotamerLibMgr: 4.0
ChimeraX-RotamerLibsDunbrack: 2.0
ChimeraX-RotamerLibsDynameomics: 2.0
ChimeraX-RotamerLibsRichardson: 2.0
ChimeraX-SaveCommand: 1.5.2
ChimeraX-Scenes: 0.3.1
ChimeraX-SchemeMgr: 1.0
ChimeraX-SDF: 2.0.3
ChimeraX-Segger: 1.0
ChimeraX-Segment: 1.0.1
ChimeraX-Segmentations: 3.5.12
ChimeraX-SelInspector: 1.0
ChimeraX-SeqView: 2.18
ChimeraX-Shape: 1.1
ChimeraX-Shell: 1.0.1
ChimeraX-Shortcuts: 1.2.1
ChimeraX-ShowSequences: 1.0.3
ChimeraX-SideView: 1.0.1
ChimeraX-SimilarStructures: 1.0.1
ChimeraX-Smiles: 2.1.2
ChimeraX-SmoothLines: 1.0
ChimeraX-SNFG: 1.0
ChimeraX-SpaceNavigator: 1.0
ChimeraX-StdCommands: 1.19.3
ChimeraX-STL: 1.0.1
ChimeraX-Storm: 1.0
ChimeraX-StructMeasure: 1.2.1
ChimeraX-Struts: 1.0.1
ChimeraX-Surface: 1.0.1
ChimeraX-SwapAA: 2.0.1
ChimeraX-SwapRes: 2.5.2
ChimeraX-TapeMeasure: 1.0
ChimeraX-TaskManager: 1.0
ChimeraX-Test: 1.0
ChimeraX-Toolbar: 1.2.3
ChimeraX-ToolshedUtils: 1.2.4
ChimeraX-Topography: 1.0
ChimeraX-ToQuest: 1.0
ChimeraX-Tug: 1.0.1
ChimeraX-UI: 1.51.2
ChimeraX-Umap: 1.0
ChimeraX-uniprot: 2.3.2
ChimeraX-UnitCell: 1.0.1
ChimeraX-ViewDock: 1.6.2
ChimeraX-VIPERdb: 1.0
ChimeraX-Vive: 1.1
ChimeraX-VolumeMenu: 1.0.1
ChimeraX-vrml: 1.0
ChimeraX-VTK: 1.0
ChimeraX-WavefrontOBJ: 1.0
ChimeraX-WebCam: 1.0.2
ChimeraX-WebServices: 1.1.5
ChimeraX-Zone: 1.0.1
click: 8.3.1
colorama: 0.4.6
comm: 0.2.3
contourpy: 1.3.3
coverage: 7.13.4
cxservices: 1.2.3
cycler: 0.12.1
Cython: 3.1.4
debugpy: 1.8.20
decorator: 5.2.1
docutils: 0.21.2
executing: 2.2.1
filelock: 3.19.1
fonttools: 4.61.1
frozenlist: 1.8.0
funcparserlib: 2.0.0a0
glfw: 2.10.0
grako: 3.16.5
h11: 0.16.0
h5py: 3.15.1
html2text: 2025.4.15
httpcore: 1.0.9
httpx: 0.28.1
httpx-sse: 0.4.3
idna: 3.11
ihm: 2.2
imagecodecs: 2024.6.1
imagesize: 1.4.1
iniconfig: 2.3.0
ipykernel: 7.1.0
ipython: 9.9.0
ipython_pygments_lexers: 1.1.1
ipywidgets: 8.1.8
jedi: 0.19.2
Jinja2: 3.1.6
jsonschema: 4.26.0
jsonschema-specifications: 2025.9.1
jupyter_client: 8.8.0
jupyter_core: 5.9.1
jupyterlab_widgets: 3.0.16
kiwisolver: 1.4.9
line_profiler: 5.0.0
lxml: 6.0.2
lz4: 4.3.2
Markdown: 3.8.2
MarkupSafe: 3.0.3
matplotlib: 3.10.7
matplotlib-inline: 0.2.1
mcp: 1.18.0
msgpack: 1.1.1
multidict: 6.7.1
ndindex: 1.10.1
nest-asyncio: 1.6.0
netCDF4: 1.6.5
networkx: 3.3
nibabel: 5.2.0
nptyping: 2.5.0
numexpr: 2.14.1
numpy: 1.26.4
OpenMM: 8.4.0
openvr: 1.26.701
packaging: 25.0
ParmEd: 4.2.2
parso: 0.8.6
pep517: 0.13.1
pexpect: 4.9.0
pickleshare: 0.7.5
pillow: 11.3.0
pip: 25.2
pkginfo: 1.12.1.2
platformdirs: 4.5.1
pluggy: 1.6.0
prompt_toolkit: 3.0.52
propcache: 0.4.1
psutil: 7.0.0
ptyprocess: 0.7.0
pure_eval: 0.2.3
py-cpuinfo: 9.0.0
pybind11: 3.0.1
pycollada: 0.8
pydantic: 2.12.5
pydantic-settings: 2.12.0
pydantic_core: 2.41.5
pydata-sphinx-theme: 0.16.1
pydicom: 2.4.4
Pygments: 2.18.0
pynmrstar: 3.5.0
pynrrd: 1.0.0
PyOpenGL: 3.1.10
PyOpenGL-accelerate: 3.1.10
pyopenxr: 1.1.4501
pyparsing: 3.3.2
pyproject_hooks: 1.2.0
PyQt6: 6.10.2
PyQt6-Qt6: 6.10.1
PyQt6-WebEngine: 6.10.0
PyQt6-WebEngine-Qt6: 6.10.1
PyQt6_sip: 13.10.3
pytest: 9.0.2
pytest-cov: 7.0.0
python-dateutil: 2.9.0.post0
python-dotenv: 1.2.1
python-multipart: 0.0.22
pyzmq: 27.1.0
qtconsole: 5.7.0
QtPy: 2.4.3
qtshim: 1.2.1
RandomWords: 0.4.0
referencing: 0.37.0
requests: 2.32.5
roman-numerals: 4.1.0
rpds-py: 0.30.0
scipy: 1.14.0
setuptools: 80.9.0
sfftk-rw: 0.8.1
six: 1.17.0
snowballstemmer: 3.0.1
sortedcontainers: 2.4.0
soupsieve: 2.8.3
Sphinx: 9.0.4
sphinx-autodoc-typehints: 3.6.1
sphinxcontrib-applehelp: 2.0.0
sphinxcontrib-blockdiag: 3.0.0
sphinxcontrib-devhelp: 2.0.0
sphinxcontrib-htmlhelp: 2.1.0
sphinxcontrib-jsmath: 1.0.1
sphinxcontrib-qthelp: 2.0.0
sphinxcontrib-serializinghtml: 2.0.0
sse-starlette: 3.2.0
stack-data: 0.6.3
starlette: 0.52.1
superqt: 0.7.6
tables: 3.10.2
tcia_utils: 1.5.1
tifffile: 2025.3.13
tinyarray: 1.2.5
tornado: 6.5.4
traitlets: 5.14.3
typing-inspection: 0.4.2
typing_extensions: 4.15.0
urllib3: 2.6.3
uvicorn: 0.40.0
wcwidth: 0.6.0
webcolors: 24.11.1
wheel: 0.45.1
wheel-filename: 1.4.2
widgetsnbextension: 4.0.15
yarl: 1.22.0
![[ChimeraX Issue Tracking System]](/trac/ChimeraX/chrome/site/ChimeraX-icon.svg){kind=icon}
Fixed; though I can't push it out yet because sussex is down.