You may want to post some info. like what games, system config and such. I play lots of games, the new duke nukem, bulletstorm, crysis, unreal 3, and have never had an issue. It may be a setting in windowblinds, I remember something to the affect of "force skinning on DirectX apps" or something to that affect, as a setting. But i've been using windowblinds for 10+ years and I don't remember it ever giving me trouble when playing a game.
and why be all wierd about it? Killing online gaming? Seriously?