I have recently bought Killing Floor, and whenever I get hit by an enemy, or anything happens that effects my HUD, (such as blood splotch decals) my whole screen goes black for about 5-20 seconds until the decal goes away. I thought this was normal and was just put there to make the game "more challenging", due to the fact that I can still see my team members names and health bars moving around while i'm blind.. Until my friend recently told me that it wasn't supposed to happen.. I tried turning off Decals but that didn't help. What do I do?