Hmm.. I've seen a similar problem when I use Open GL (everything goes grey), switch to to software and it's fine? What happens if you don't make the camera move ? Do the lights change or move in anyway? Is there a background plane ? Have you tried using another codec ?. Try .avi instead of quicktime. Check display driver/colour depth settings match render settings.

Pinky - you left the lens cap of your mind on again.