I don't want to file an official bug report because I'm not so great at that, but when I move my laptop to a cinema display the audio still plays on the laptop despite the picture being on the cinema display, when I open up VLC hooked up to the cinema display it plays the audio through the cinema display's speakers, but when I disconnect it to go back to "laptop" mode the audio disappears completely.
I've had this problem since early 2009 when I got the monitor, I'm just so tired of it I thought mentioning it might get it fixed. I hate having to restart VLC every time and scroll back to where I was just to get sound back
EDIT: Also, VLC is up to date, this problem was in Leopard and Snow Leopard. Everything is up to date, and I reformatted about a month ago and the problem was there even after the format. I am 100% sure this is a VLC problem