[bambamat]

I use calibre all the time. I had a book I downloaded through Digital Editions, but never used Calibre with. Have since removed the book from DE. Now everytime I add a book to Calibre, I get that one book over and over again.

Steps so far
Update to the latest version Calibre
Uninstalled and reinstalled Calibre
Uninstalled, used Regedit to remove all occurrence of Calibre. Rebooted and reinstalled
Uninstalled and reinstalled DE

Nothing has fixed it. Any suggestions are welcome