Just realized that my 1520 front facing camera isn't working after denim update. Anyone having the same issue?
Try
restarting your phone (power off then power on). If that doesn't do anything, try a
soft reset (press the volume down button and power button together until your phone restarts).
If these two don't work, then a hard reset (which will erase all your data from your device) may need to be performed, but we won't go that far since it is unlikely that that will resolve the issue anyway. Instead, have your phone checked in a service center if not having a front facing camera is really urgent.