just noticed another little thing which might help track the bug down:
the layer thumbnails are also affected by the same graphics corruption...
and i don't know if it has something todo with it but it seems that the MASK-Effect is broken too
i've tried to build a health / magic meter with masking (wanted animated blood & mana for health)
for me it doesn't mask anything at all
i've also tested this with the scrolling text example here:
it doesn't look like the image for me, instead it shows the whole text without masking it
maybe someone else with a geforce could test this