I don't get a direct crash on startup, but after playing around for a while, some shaders begin to flicker and look completely wrong. After a short time, the viewer will slow down the whole system until nothing works anymore.
After I managed to close down the window (which needed about 3 or 4 minutes), any DirectX Application was not working anymore - I needed to reboot the system.
To me this looks like some sort of overflow when changing shaders too often?

I'm using a Geforce 7900GT.