my proximity sensor has been acting up since the 4.3 OTA update, my screen stays black after calls, sometimes after screen time outs and I normally have to wait awhile before it'll turn back on, The infra red light for the proxy sensor stays on as well, it used to just blink occasionally. and yes I can see the infra red light, first sensor to the right of the speaker, for those of you who cant see it try looking at it with a camera and it'll become visible. since this seems to control my screen even while not making a call I need to disable it or calibrate it, I have already disabled it at phone, call settings, turn off screen during calls.