If I put a clean install of a TW rom it does not work either. I have to change the dialer settings. My girlfriend told me this happened as soon as she installed the 4.3 update way before I rooted the phone.It happened to her sister too. I did not know about the issue until I rooted. . I doubt it's the recovery I'm using. I had problems installing CM with TeamWin Recovery. I had to use Philz. Like I said, I don't mind keeping her on TW roms and she doesn't care either. It would be great to find out what is causing this. It's got to be something with the proximity sensor detection, but the proximity sensor does work otherwise the TW gestures and features would not right ?