[ChrisW]

isn't this the issue that's worked around by adding the following to ~/.xbmc/userdata/advancedsettings.xml :

Code:

<advancedsettings>
<audio>
   <streamsilence>1</streamsilence>
</audio>
</advancedsettings>

i also have tried this some time ago, but that didn't change anything.

I think the problem is now solved on my system. I've installed the new beta from here:

http://xbmcfreak.binkey.nl/xbmcbuntu-12....a01-v1.iso

I also added the x-swat repository to get the latest nVidia driver:

Code:

sudo add-apt-repository ppa:ubuntu-x-swat/x-updates
sudo apt-get update
sudo apt-get upgrade

Hopefully this will work for you too!