Over the last couple of days I have had this problem. When I awaken my iPad the box for my pass code appears, but I can't get the keypad to come up to allow me to enter the code. Usually a reboot will get it back but sometimes even then I have to play with it a while to get the keypad to appear. I've currently disabled my passcode for fear I won't have a way to unlock. Anybody else had this problem? Any solutions?