I'm having the same problem and was told that one of the books messed up my index and to delete all the books and send them again one by one. I have over 1000 books on my Kindle and that seems like a pretty major step. Books sent from Amazon work flawlessly ... not the ones thru Calibre ... It is very frustrating to have it suddenly stop working. I love this software. I have 4 Kindles, so how can it be the index if none of them are receiving the books thru different email addresses?
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