I stumbled across this problem via Google. Fedora 17 host, Fedora 18 guest, and -- you guessed it -- VirtualBox. And the symptoms are the same. I had no audio for the users until I switched those from the default to the LFE.
On the bright side for you, it does not seem to a downstream bug. ;) Sadly, so far, it's not clear to me whose bug it is.
I stumbled across this problem via Google. Fedora 17 host, Fedora 18 guest, and -- you guessed it -- VirtualBox. And the symptoms are the same. I had no audio for the users until I switched those from the default to the LFE.
On the bright side for you, it does not seem to a downstream bug. ;) Sadly, so far, it's not clear to me whose bug it is.