The Audigy cards are the ones with the most problems
. If it works when you don't login to GameSpy, I don't see how it could be your sound card.
I've heard of other people having this problem. I'm not sure what they came up with. You might find the information if you search through the older posts here and/or on the offical forums. Send a report to tech support.
(I may not agree with thoughts posted under this name)
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