Ubuntu 12.04 64 bits
Gnome-shell 3.4.1
I have defined 2 users: one with administration rights and another standard.
With the user with admin rights there isn't problem but when the other user enters in his gnome session it has the sound muted:
But the gnome-alsa-mixer shows all normal:
If he move the volume slider the sound is unmuted. What could be the problem?