I would try to find out if it is file-specific or machine-specific.
I would try to open it on another machine. Also I would try to copy-paste the Walls with Empty Doors in them into a New&Reset file.
I would also check all the parameters and settings of those Doors to see if any parameter seems odd.
I would also check if it may be a corrupt ArchiCAD installation because the Empty Door object comes from the ArchiCAD.dll file.
Also, sometimes Macs have these permission issues. I would also check that.
Also, cleaning preferences may be tried.
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