Screen problems on EvoCity

Whenever I play on evocity, my screen flashes different colors or black and white when I take out anything other than a gun or the ‘hands’ tool in some RP gamemodes.

Bump

I’m curious, does the problem look anything like this?
http://www.facepunch.com/showthread.php?t=614958

No, mine is as if a solid-colored overlay is being applied to my screen.