Did you wipe the cache, data, and Dalvik before boot stock 4.3 ROM for the first time?
That my friend means there is a HW problem what could suggest as a last resort Remove SD Card, Sim card and Battery for 10 minutes
Only connect the battery and turn on check camera
Follow this thread to check your camera Firmware http://forum.xda-developers.com/gala...river-t2006128
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