I'm always using the last version of Calibre with Windows 7 32/64 and 2.10.0 fw, and I get this message from time to time. I have not managed to find the reason yet...
I'm also using CoolReader and KoboLauncher installed on my Glo and don't care much for the Kobo's database. It just bothers me when it happens, because it corrupts the database and I have to copy backed up one or do initial load of my books over an "emptied" database.
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