64bit client crashing on startup

I had the same problem as well.
i5
9600GT
Win7
Non Steam, 64bit and DX11

I could fix by disabling the Anti-Aliasing in the production_Config.ini (C:\Users\username\Documents\My Games\Path of Exile):
dx11_antialias_mode=0
dx9_antialias_mode=0

UPDATE:
I turned it back to DX9EX and now it works with AA and in Fullscreen. And finally the graphic looks nice.

Same problem here after my 980gt died and I swapped in an older R9 290. Now I cant play dx11 at all, it crashes on start up, and deleting the.ini lets me play dx9 one time... but if i quit ive got to do it all over again.