If this happens to you, you will have to follow these steps. Delete or backup all of the Ebooks from iTunes and on the device. Connect with Syncios so you can check the Ebooks have been moved. Restart the Ebook via iTunes and restart the device. Connect again with Syncios and you should be able to mange and view your Ebook again. If it still isn’t fixed, send the log file to the support team via feedback menu.