Hi everyone. Long time GoG.com user, first time poster. Also long time I-war fan.
Here's the problem: I played the mission Salvage. No problems with the game up to that point. When the game displayed the in-game cutscenes, it displayed the first frame correctly, then every other frame displayed so that the scene looked like a visual mess, with garbage on it. I could still hear the audio just fine during the whole scene. But the video is really messed up.
I'm playing on Windows 7 64-bit Intel i-5, ATI 5850HD card, 8gigs RAM.
P.S. I can tell the game is using the Voodoo2 version.... I think. Is it 640x480 or is displaying in 800x600?
Aside from this problem, the game plays perfectly. So I hope someone can help.

Before anyone else asks about it, I think you can rule out Windows 7 64bit as the source of the problem. I use it too, and I've had no trouble with I-War cutscenes so far.

I also have the same problem and I am running Windows 7 Home Premium 64bit. It also causes problems with the CGI for Interstellar Jumps and a few others.

Thanks Ravenger. I followed the instructions on how to install dgVoodoo wrapper in this thread and that solved my problem.