I suspect that the use of Dropbox is the cause of the corrupt database.
To avoid problems you must allow Dropbox to fully sync before you start calibre and after you exit calibre, before you shut down the computer. And of course you should not run calibre on more than one computer simultaneously, if they use the same shared calibre library.
Last edited by Adoby; 11-08-2013 at 10:14 PM.
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