Sound input/output selector indicator for Ubuntu/GNOME.
It shows an icon in the GNOME Panel. The icon's menu allows you to switch the current sound input and output (i.e. source ports and sink ports in PulseAudio's terms, respectively) with just two clicks:
The application makes use of the native PulseAudio API (version 4.0 or newer is required).
For details see http://yktoo.com/software/indicator-sound-switcher
Run the application in verbose mode to see the detailed log:
indicator-sound-switcher -vv
and, once the error condition has been reproduced, file a bug report and attach the output to it.