I am going insane because of this issue.
I just recently built a Haswell system. I carried over my HD7970 from my old rig (Intel Q6600, 680i Chipset, Windows 7 64-bit). I had NO PROBLEMS with the OLD RIG. But my NEW RIG is having horrible audio issues. I use my Plasma TV as my audio device. Any type of video that is playing experiences an audio cut out if I move Windows around or basically try to do anything other than watching video. When I go to full screen, audio cuts out. When I move a browser tab, audio cuts out. This happens in the browser (Netflix/Youtube) or VLC. Secondly, game audio is non-existent. Games have no audio at all. SOMETIMES after a clean install of the drvers, the audio works fine, but most of the time it doesn't. And after I reboot or after the computer goes to sleep, the problem comes back.
I have tried both the 13.4 and the 13.6 Beta drivers.
Intel Core i5-4670k
16GB Corsair Vengeance (DDR3 1600, CL7)
Sapphire Radeon HD7970