This seems to happen often to me - probably because I mess with my Rawhide systems, but
I've lost the cut little GNOME sounds that used to play when perform various actions
in GNOME. Pulseaudio is loaded,
System->Preferences->Hardware->Sound->Devices->Sound Events is set to
PulseAudio Sound Server, on the Sounds tab Sound Theme is default and all the checkboxes
are checked, but I get no sound effects. What do I need to do to get my sound effects
back?