Graficproblem wth worldbuilder - need help

Hi guys!
I have problems with my worldbuilder.
Here a picture:


perhaps it is my system?
I have a new PC with quadcore ( Amd Phenom II X4 ), Radeaon HD 5850 and Windows 7 Pro.

Can someone help?
Thx guys!

I had this problem. You have to turn one of the overlays in the top right (where fog and such is) off, and you should be fine.

Kay. Mystic send me a new spDevices.lua and this helped me ^^