what operating system are you on? If it's windows 7 I may avoid it for a litte longer..
*edit*
the only audio bug I have ever had is where I die, so the death sound effect starts (that foggy, misty, you're dead sound), then I leave that game. The sound effect never turns back off till I die again then come back to life in some other game. Fortunately/unfortunately I didn't die in my next 3 games...but I was basically playing with no sound...other than the sound of wind of whatever that dead noise is supposed to be...lol