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Hoods7070 - maybe you already tried these, apologies if you already said so
- run calibre on your laptap [sic] in minimal safe mode
- backup library & rebuild the database via Library maintenance->Restore database
- rename the calibre config folder, calibre will create a new one, when it starts you'll have to use Create/switch library to tell it where you library is - if no effect then revert to prior calibre config folder.
- run a system file checker /scannow
BR