The framerate unlock and FXAA apparently (still have to check the latter). If it broke FXAA, it almost certainly also broke SMAA, and it most likely also broke all the AO methods. And the improved DoF. I'll look at all of that tomorrow.
Setting unlockFPS to 1 seems to be the only thing that makes it crash for me, I have these settings and they're working fine:
aaQuality 4
aaType FXAA
ssaoStrength 1
ssaoType VSSAO
dofOverrideResolution 1080
dofBlurAmount 1