This has happened to me a couple times and Im not sure how to fix it. I have repaired the client and it has not helped at all. Before and after the game there is sound but once I load in there is no sound effects or music. This does not happen all the time only once in a while. What can I do to fix this?

Bump.

I'm having the same issue, but only when I run Teamspeak.

This happens to me all the time. I have sound in like.. 10% of my games. :/ I do usually have skype up, but with skype up it's still like only 10% of the my games have sound at all.

I've been having this problem too. If it makes any difference my skype was in use as well since my friends wish to communicate out of in game chat.

I'm also having this issue, I never use skype though. Strangely enough from the little bit of experimenting that I have done. It doesn't seem to happen if I am in very close proximity to my router, it's only when I have a low to moderate signal. Not sure if that's coincidence or not.

I am suffering from this as well, I found that if you disconnect from the game and reconnect it will usually fix it. It has every time except for once. I'm looking for a more permanent solution though.