After a fresh install of lion on my late 13' 2010 macbook air, and 2011 macbook air, my Thunderbold/mini displayport to DVI adapter no longer works. When I plug the adapter into the MBA, the screen flashes for a second like it has detected the External LCD, but the Monitor stays in standby. I've clicked detect new monitor, and it still won't work. My thunderbolt to hdmi adapter works fine. Anyone have this issue?