Quote:
Originally Posted by polly
Also, I read the manual before I started building my Calibre library and I lurk here, so I've known from the start to treat the Calibre library like a black box and leave it alone. I've never mucked around in the Calibre library folders. Some of the items left behind were added as recently as last month, so it wasn't all my early stuff either. It's easy enough to fix, just puzzling why it happened.
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I was playing around with a backup copy on another machine and made some observations.
Somehow Calibre has
forgotten that/
failed to really delete, some formats that were NOT displayed in the library for existing books (same index#).
I used the a/b notation above because I have deleted 'rotten or obsolete' formats via the Meta-data GUI on occasion. One of the many updates may have caused this process to burp.

(Yes I run "check DB Integrity" from the advanced options tab.