I suspect a damaged file in Calibre Preferences folder
(not a MAC person)
Search for a (hidden) file gui.py
That should find the preferences folder.
If you rename the Containing folder. Calibre will recreate a new one when it starts and can't find it.
Note: ALL CUSTOMIZATIONS done in preferences will default to original
Note IF you have a Backup of this folder from BEFORE things went south, just REPLACE it
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