Comment 12 for bug 1181134

Re: /usr/share/dbus-1/services/indicator-sound.service referenced in report #1208204

I set the above file back to as it was originally installed with package indicator-sound under saucy:
          Exec=/usr/lib/x86_64-linux-gnu/indicator-sound/indicator-sound-service

Both anomalies return repeatably:
          * "xfce4-indicator-plugin crashed with SIGSEGV in g_type_check_instance_cast()"
          * Symptoms of report #1208204

Then, I used the suggested patch:
          #Exec=/usr/lib/x86_64-linux-gnu/indicator-sound/indicator-sound-service
          Exec=/usr/lib/indicator-sound-gtk2/indicator-sound-service

Both anomalies go away. The indicator-sound package will eventually be formally fixed in saucy. Until then, you could try using the patch to see if your crashes go away.