Already tried that, still no dice :[ I'll run a fresh install tonight and let you know if that works.
Edit: Fresh installed, still no change. Get booted back to the main menu during the "Checking Game Files" step every time.
I came from about three years of Tremulous, and when I first saw NS2 on Steam, I saw Trem 3.0 :P it took some getting used too, especially the visual clutter and whatnot. (In Trem, you didn't have trouble seeing anything, period, but I'm fairly used…