I've just recently experienced this very annoying bug with my droid x. When I am ending calls or needing to use the dialpad during a call, the dialer is gone and I just see my home screen. The proximity switch is working fine and turning the display off when I put the phone to my ear; however, as soon as I remove it, the call screen is gone. The notification bar is blinking green and I pull it down to end the call. This is especially annoying when I receive a call while the phone is locked, because it does not give me the end call button until I enter my pass code and pull the notification bar down. Help please.