I've had this same issue in a 2.x version and now 3.30 version of Calibre. I'm running this on Debian 9 (LMDE3) and it appears that the Insync Google Drive synchronization tool causes/contributes to this issue. In other words, when Insync is paused, and I edit the Author field of any file (which changes the folder name of where the files reside) then there is no problem, but when Insyc is active, both the cover and the file disappear (are not in the Trash nor elsewhere in the folder structure).
While the workaround is to pause Insync, it would be preferred if Calibre were robust enough to operate as expected with sync/network drives. Since this appears to be a long-standing issue, my guess is it has to do with how file operations are performed by Calibre (specifically, renaming). -- You received this bug notification because you are a member of Edubuntu Bugsquad, which is subscribed to calibre in Ubuntu. https://bugs.launchpad.net/bugs/1758548 Title: Changing title or author to uppercase/lowercase causes book to disappear (French Language) To manage notifications about this bug go to: https://bugs.launchpad.net/calibre/+bug/1758548/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~edubuntu-bugs Post to : edubuntu-bugs@lists.launchpad.net Unsubscribe : https://launchpad.net/~edubuntu-bugs More help : https://help.launchpad.net/ListHelp