I just got a 24" Dell IPS display to use with my 2012 13" i7 MBA. It's awesome. So here's my question/issue. I need to use this as a second display, not mirrored. When I do this, I want to full screen Safari and many other apps. When I click full screen, it goes full screen on my MBA screen, NOT the external Dell display. No matter what I do, I get the grey background pattern on the dell and the full screened app on the MBA. WHY? It's seriously pissing me off. There doesn't seem to be a way around it unless you mirror, which is not what I need the monitor for. I hope that you guys know of one. It's probably right in front of my face..... Any insight here is greatly appreciated.