I am using lubuntu 13.04 and out of the blue, the volume control icon that sits in the panel stopped opening alsamixer, when I right-click on it and chose "Volume Control Settings" - it used to open alsamixer. I can still change volume and mute/unmute when I left-click on the icon.
I can run alsamixer just fine from a terminal.
Can you help me? It's not serious, but annoying ;)
Thanks