i would say try installing a different rom, but do not back up the current rom since you know there is no working camera functions, see if you get a camera working on the new rom, then make a backup of that rom as a restore point in case its apex not working for you, then reinstall apex and see if it works, long process if rebooting the phone doesnt work(gmenfan83's suggestion).
make sure you wipe data and cache to make sure its all cleared out
Apex 1.3.0 the camera was working, Apex 1.3.1 camera not so much. Of course, in my excitement to install .1, I didn't do a restore of the 1.3.0 before upgrading. Bleh.