This is rich!
I stop FREDing FOW:C3 so I could play (and finish) WC:Sagga and INF:Alliance.
After I did that and removed both from my PC, I went back to FREding. Everything works fine, but when I play a mission under Open GL some effcts go totaly wrong!
First - the targeting box is dancing all around.
Second - the shield hit effects, smoke trail and flak effects look absolutely AWFUL (completely black for shields, black boxes for smoke particles and plain, dark yellow..something..for flak)
Strange this is that I didn't touch anything. Madia VP's are enabled.. the only thing I did is change resolution to 1280x768. Tried changing it back and playing with the color depth but hte problem persists
Under D3D everything works fine, but looks like it's low-res.
To make things stranger I tried using both the 3.6.9. and the HEAD build - the same thing.
It's funny.

Could be that I probably mesed something...hmm..I did remove the -jpgtga flag.