I left my jb ipad2 on and it drained the battery. Upon recharging, my ip2 would not run any apps and reboot if I did. I could not restore it via the jb backup package because, like I mentioned, the ip2 would reboot if any software is run. I had to take my totally tweaked ip2 and install IOS 5.01. Not the end of the world but a real pain none the less. I'm not sure why this happened as I haven't installed any new apps or changed the config in a couple of weeks. Come on jb dev team....now I need the new jb!!!