No solution yet... I was hoping for one though. But there only seem to be people with the same problem, but don't know what to do about it either. And people who never have experienced the problem at all.
Ok I'm going to try the drivers (81.98 and 77.72). Thx Hartmann and Richard Zapp.
I'm using a tweaked version of the 81.97. So that could be the problem.
If that ain't working I will reinstall SHIII; maybe the files are messed up.