I am checking two parts within an assembly that I know are interfering with each other. Results come back No Interferences.

I've tried different parts in the same assembly, the same parts in a different assembly, and different parts in different assemblies. All with the same results. It was working last week, not sure what I did to make it stop working. Restart and reboot didn't fix it. Any suggestions on what to try next?

I'm thinking it's just more graphics hardware issues with this Quadro 6000.

SW 2011 SP5.0

Win7 64-bit