I can not figure this out and it is driving us crazy. We use our iMac as a "TV" in our kitchen (watch movies and TV shows through iTunes). One time about a week ago I wanted to send what I was watching on the iMac to our appleTV in the living room. So I used Airplay through iTunes and it worked well. The problem is that ever since when we try to watch anything on the iMac (using iTunes) it defaults to airplay (and always to the living room ATV). So you have to use the airplay drop down in iTunes to bring it back to the iMac. Please help, why does iTunes default to this everytime.