Seriously is there one legitimate reason why I should not be able to mirror my 2010 MacBook Air (13"/1.86/4GB/128) onto my HDTV from my Apple TV using Mountain Lion? This is such BS. So typical of Apple. I am so frickin' mad right now...feel like punching a wall. AirPlay mirroring was one of the main reasons I was going to upgrade to Mountain Lion in the first place. Things like this may one day force me to make my home completely Apple product free.