it should, and i don't know why it won't. though, as noted, 1680x1050 is not a standard 4:3 aspect ratio. maybe it is because the game is trying to force 4:3 on top of your native mode? dunno... perhaps the black-bar fall-back is all you can do.
taks
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It won't. I can run Oblivion in 1680x1050 on my widescreen lcd perfectly (my monitors native res), and I can run it with NWN2, but the frame rates suck. So, I use 1024 x 768, it's not appealing, but it runs a lot smoother.
btw, I have a 7950 GTX, FX-60 and 2 gigs of ram