@Chris: No problems showed up in the acklog, just normal engine output.

System is:
AMD 1.80Ghz CPU
~800 MB RAM
Nvidia 6100 PCI-E

And the ghost image is only on the background when there is no skymap applied, try having a room with some stuff in it, and load another level which has nothing in it. Make sure you face the stuff when you're in the first level.

I thought the crash was kinda odd too, but It's not an engine output crash, it's a windows crash.