I finally got around to forcing DX11.
Oddly enough the second client errors out with:
Name: Capture.JPG Views: 1518 Size: 21.2 KB

I have two 7970 vid cards each powering a monitor. Never had this issue before.

I created a new Window Layout assigning the other character to the problem monitor and got the same error. Maybe that vid card is faulty...looking for a DirectX 11 test I can run on that monitor/vid card.