Is this me, or a problem for others as well? When I mute the sound on my Macbook, while using external speakers, I can sometimes unplug the speaker cable, and sound comes out of the internal speakers. So I am playing music in iTunes, then unplug my speakers after already muting them, and they "unmute" when I pull the cable out. The sound pref pane shows that I still have the speakers muted. This does not always happen, peraps around half of the time.