Comment 18 for bug 461123

  File "/usr/share/avant-window-navigator/applets/volume-control/volume-control.py", line 264, in refresh_icon
    icon = [key for key, value in volume_ranges.iteritems() if volume <= value[0] and volume >= value[1]][0]
IndexError: list index out of range

Easy, just do a right click on the applet crassed, open Volume Control, and get down the volume of the system. Then restart the applet pressing it and that's all!

Please, forgive my poor English.. =D