Proximity sensor doesn't work correctly after 4.3 update

Question

The proximity sensor disables the screen when I place the phone near my face when in a call, that's fine.
However, it never re-enables it when I move it away. This happened prior to the 4.3 update, however I could press the home button and it would light the screen up.
That doesn't happen anymore, so I can not hang up a phone call once the screen goes off.
This is a major defect

Answer 1

I have the same issue with a 2 month old Galaxy S4 and I noticed it after the last push from Verizon whihc may have been the 4.3 update. Proximity sensor won't light up the screen again when you move it away from your face.  Verizon told me to do a factory reset, Samsung told me to do a soft reset then clear the cache.  Did all and still have same problem. Had a call yesterday and person on other end did not hang up so I had no way to hand up on my end.  Am turning off the proximity senson durring calls for now but it will use up more of the battery with the screen lit more.  They need to fist it.