Sorry for the long-winded question. I've been trying to figure this out to no avail. I have a 27" iMac with a 24" Cinema Display connected as a secondary display. Say I want to watch a Youtube video full screen in one window, - e.g. on my iMac, and then continue to write email/surf web etc on the 24" attached display, as soon as I click into the 24", my iMac movie loses full screen. It's even worse when watching movies using VLC, because then the secondary display goes black! Is there any way around this? Thanks!