OpenGL problem for ATI R9500Pro


I got a problem with my Radeon 9500Pro
gfxcard. I get “purple polygons” in opengl
( for a screenshot ) for some reason.
(You can notice how the background is shaded with the purple color and also that some random polygons on the models allso is )

Everything works fine with d3d, and I have tested the 3.0 and 3.1 drivers with same result.

Anyone here got a clue what might causing this?