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Do you use the recently added Category Notes feature for Authors, Series etc?
If not, when calibre is closed remove the .calnotes folder from the library folder. Calibre will recreate a fresh .calnotes folder when its starts. If it happens again then something other than calibre is messing with the .calnotes folder… probably something which is run at startup (in the tray) that doesn't like folders that have a '.' as the first character.
If you do use the new feature, wait for Kovid's reply.
BR
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