That same problem has been reported on the Official Forum and also the Unofficial Forum at Redqueen, other players have said that loading their auto saves seems to clear it up. It helps to not use 3D also. It just doesnt work at all.
You might want to see what is being reported on the Interplay Forum and RedQueen (where a lot of the programmers are showing up offering help).
RedQueen is at:
http://redqueendesign.com/cgi-bin/fo...erns&number=12
Good Luck.
**v**