Initial symptom was that certain programs would "go white" after being run quite a few times. All shading and stuff was still there but the textures were gone.
So I ran Memstatus and could see as programs ran and exited the video memory would not free itself.
After chaning texture preferences the program worked normally again.
I have only seen this on two ATI cards and never with a NVIDIA card.
It is very annoying.
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