Just bought 3 of these for my kids, but I have a maddening issue were every time an App is installed it disappears after the device is powercycled. Even tried creating a simple folder and that vanishes upon a reboot as well. Also tried installing the Amazon App Store, it vanished along with all of its apps and settings too. I've reinstalled the OS by using the image from Coby's web site but that did not make any difference. Anyone else observed this behaviour? I'd hate to have to return them as they seem like pretty decent tablets.