The only thing I can find is
this. But I guess you're not rotating your desktop?
Things to try....
make sure you're not forcing any display settings (rotation, refresh rate etc. just set it all to app managed and defaults)
update chipset/mobo drivers
update gfx drivers
install latest directx update from ms
if you're on Vista run it as admin.
other than that not sure tbh. Google did throw up another result but it's in German and no one answered the guys question.
what's your spec, o/s etc?
edit: and which is the 3rd test? can't remember off hand.
I have a 2900, E6600 and it works ok on XP x64 and Vista x64. Though I can't submit my results on Vista for some reason.