Doug:
Strange problem for sure, I think you have tried all my best suggestions already, damn. It sounds like it is a conflict with something running on your machine, probably not a hardware problem. This one is going to be hard to track down.
One way to eliminate the hardware as a problem is to install another hard drive and put FB and our program on it only, play and if it doesn't crash then you know it is a software problem, if it does crash then hardware.
Let us know.