Dear x-users, I've tried to open x3d files using recent Mac and Linux dailies, but without any success. This would be useful as a way to view maps colored in Chimera 1 & Segger. I take it from docs/user/commands/open.html that the following usage should be supported: open ~/Desktop/color.x3d format x3d but I only get the error below. Any suggestions would be welcome. Aaron -- Traceback (most recent call last): File "/Applications/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/cmd_line/tool.py", line 158, in execute cmd.run(cmd_text) File "/Applications/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/core/commands/cli.py", line 2257, in run result = ci.function(session, **kw_args) File "/Applications/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/core/commands/open.py", line 108, in open models = session.models.open(paths, format=format, name=name, **kw) File "/Applications/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/core/models.py", line 351, in open session, filenames, format=format, name=name, **kw) File "/Applications/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/core/io.py", line 368, in open_multiple_data models, status = open_data(session, fspec, format=format, name=name, **kw) File "/Applications/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/chimerax/core/io.py", line 298, in open_data open_func = fmt.open_func AttributeError: 'NoneType' object has no attribute 'open_func'