No sound when mirroring

Hi, I'm new here, my name is Koen. I hope somebody can help me with my mirroring problem.
I'll try and make a detailed description of my setup and problem.
Situation is as follows:
- late 2012 iMac 21,5" base model running OSX Mountain Lion 10.8.4 (12E55)
- Atv 3 (MD199NF/A) with the latest software (5.3 6105)
- both ethernet connected through a modem/router and switch
I don't have any sound when using airplay mirroring. I've tried vlc, itunes & safari (youtube and a dutch video site).
If i use the direct airplay function of iTunes it works just fine. When I try mirroring after that, and back to airplay on itunes,
this stops working too. Only way to get the itunes airplay function working again is to select the airplay logo, multiple outputs, apple tv.
ATV3's standalone function of playing music from the itunes library never gives any problems.
Trying to reboot all devices involved sometimes gives the solution, but I can't seem to figure out who the culprit is.
Other times it just starts working, what appears to be completly random...
Because my bluray player works fine with my amp, and the standalone atv doesn't give any problems I figure it must be a software/driver issue.
Is there any way I can reset the driver from the terminal or maybe somebody has any suggestions??
I'm fairly new to OSX.
Cheers,
Koen from the Netherlands.

With the introduction of Mavericks, I'm not experiencing these problems anymore.
I did find out a useful tip for people using mirroring with mountain lion:
Always return to non-mirroring / non-airplay if you're switching to another audio output. So from itunes airplay to mirroring, don't do it directly, but switch it off first. then the desired output.
From a working setup, when using this tip, the audio continued to output properly .
Cheers,
Koen

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