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The mixer plugin for the panel doesn't work on Xubuntu Edgy Eft and Feisty Fawn.
When I upgraded to Edgy the plugin worked, but after some more updates it seems it is not working anymore. It flashes shortly when you add it to the panel and then it crashes. I have no idea which update has caused the error.
I can still use alsamixer or my multimedia-keys, but I think it is very convenient to scroll the mouse on the panel plugin to change volume.

Reproducible: Always

Steps to Reproduce:
1. klick on the panel and choose "add"
2. choose the mixer-panel-plugin