I have the same issue like yours.
The clicking sound is from our av receiver that is trying to manage the av input signal that our pc is CONSTANTLY changing after the crappy Gf card driver update ...........
Hellooooooo AMD people need to fix your drivers.
I'm using a 5750Hd card.
1: Right click on the speaker icon in the right down corner
2: Choose "playback devices"
3: Choose AMD HDMI Output and set as default
That dont fix the problem.
I have the same problem.... Please help. This is annoying.
I have an Onkyo 626 receiver with HD7700 Radeon.
I lost all sound completely yesterday and can no longer get sound with the 7700 connected via HDMI to the receiver. If the 7700 goes straight to my TV via HDMI then I can get sound.
Oh, and I also get the clicking.
Did anyone find a fix for that?