I currently have a 2008 iMac running Mavericks, with a Sharp LCD Tv connected as a secondary display via mini-dvi to hdmi output. I've read that Mavericks addresses the 'full screen with dual screen' issues but that doesn't seem to be the case with what I want to do. Basically want to put an embedded video through Safari/browser full screen through the TV and be able to use the imac monitor without any problems. However every time i click back on the imac monitor the full screen goes off on the tv. I have tried separating Safari into Desktop 2 and clicking back into Desktop 1 (on the imac screen) but same result happens. Ideally I would also like to be able to turn off/on the imac display with the other unaffected, but turning off the display seems to turn off both displays. Anyone know of a way to resolve either? Not too fussed if i cant turn off individual imac monitor but the full screen issue is rather annoying!!