Hello, ever since I have downloaded 10.10.2, I havent been able to Airplay. I know for sure it isnt a problem from my Apple Tv because I tried Airplaying to multiple Apple TV in my home and it didnt work on all of them. Also I have tried from my Macbook Air (which is also on 10.10.2) and it works perfectly So what happens is that after I click the Airplay logo and click the apple TV i want to connect to and that the Apple TV is selected, it only shows me a black screen on my TV. I noticed that under the option Use Airplay Display to the check marks stays selected on Extend Desktop and when I click on Mirror iMac option, THE CHECK MARK STAYS ON EXTEND DESKTOP Also it is important to note that sound Airplays out of the TV .when I watch a video on youtube for example, the TV stays black but the I can still hear the sound of the video on the TV. Sorry for the bad english.