it seem since i have updated to ios 6 my books that I have transferred with calibre is no longer syncing. I have uninstalled itunes and reinstalled reset my ipad2 twice and restored. I have itunes set to sync all books it says that i have 1424 books, but the only books that are syncing are the books that I restore from my purchases. I have tried checking only selected books and the same thing. I capacity bar will keep say that it is using xyz space after choosing either option but will drop back down after sync. Have no idea of how to fix this problem.