I just started playing with UDK recently and I've got an undoubtedly simple issue with the skybox/dominant direction light when I activate light shafts.
Basically they don't appear to sync up. The shafts come through normally at the map origin and angle more severely the further from the origin I move.
Here's a pic:
Sorry if it's a trivial issue, but my google-fu and reverse engineering skills are lacking today.