I'm having a weird problem with the proximity sensor since upgrading to JB from ICS. The sensor will work on calls I make, but on calls I receive it invariably does not...resulting in all kinds of embarrassing key presses when receiving a call. What's more, I notice that the dialer behavior is different on calls...the keypad used to stay on, but now it disappears on calls. I've tested the sensor with Sensor Test from the app store, and it appears to be working fine...it only seems to stop working on received calls anyway. I've also checked Settings to make sure that the proximity sensor checkbox is checked in Call Settings. Any ideas? Thanks all...