Window heavily cropped?

[Mach]

I downloaded the game a few days ago and for some reason, whevever I join a game, a good chunk of the left/right screen are black. I tried changing my resolution settings but there's only one option availible and it's the one I'm using.

My computer is more than capable of running this game fullscreen.
Help?

[76561198151392949]

I've had that too, but I never saw it as a problem. try turning fullscreen on and off or closing and reopening it