Quote:
Originally Posted by jcmag
powering off made things worse... all books vanished!
I have logged off/logged in, and now it seems to work far better 
All my books stay there  Thanks!
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All that is consistent with a corrupt database on the device. While it was running it was working on an in memory copy. The power off forced a write to disk which probably failed and didn't store the book info. The power-on attempted to read the database which didn't contain any useful information. The logoff replaced the database with a new empty one which fixed things.