[wonder]

The firmware updated automatically, and suddenly all ebooks sent to the device via SendToKindle are displaying error messages. Also, MOBI format comics don't open in full screen; the page-turning animations are gone, and there are no options to enable full screen or page-turning animations. I then deleted the books from both my device and my Amazon account, copied them from my local machine, but the error persists. Even logging into another account doesn't solve the problem. The only current solution is to restore factory settings, then immediately enable airplane mode on the home screen, and then copy the books and comics to read them normally. However, this has a very annoying problem: every time I exit reading, a registration/login window pops up. I suspect Amazon is doing this intentionally! Sorry for rambling, I just wanted to ask everyone, after updating to the latest version, how can I ensure that I can still read books and comics normally after logging into my Amazon account?