Today I discovered an audio problem I guess. I can't tell you exactly how it is. I just hear a Special Infected in a spot while it is in another way... For example when i hear a Jockey, i hear it behind me while he is right in front of me. For survivors it's the same. I can't play like that, my L4D2 skills are mostly based on hearing. I have about 100 addons, and if anyone may help me, please.