May be the solution is here
http://www.mail-archive.com/desktop-bugs@lists.ubuntu.com/msg375353.html
if /home partition is full gnome cannot write to /~/.local/share/gvfs-
metadata/home
this file will be 0 bytes in problem systems.
remove
/~/.local/share/gvfs-metadata/home
and reboot
this
How this bug came up for me.
I was using 2 programs
1) Totem paying a shoutcast play list
2) StreamRipStar ripping shoutcast streams.
When i pressed from StreamRipStar the Hear Stream which played in
Totem sound stopped and could not hear anything.
No youtube, no mp3 no shoutcast... nothing.
