New AMD drivers muting games?

I just installed Marvel Heroes and it told me I needed to update my graphics card's drivers. I ignored it and played for a while, and everything was fine. Then I installed the drivers, restarted, and now Marvel Heroes, as well as at least one other game, The Secret World, are completely muted. I can't see any options anywhere in my sound settings that would cause it, and updating those drivers is the only change I've made. My sound is via the HDMI output of the GPU, and the weird thing is that all other sounds seem to be working, it's just games that are losing sound.
When I tried googling this I didn't see anything related to my problem. Does anyone have any ideas? Thanks

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