Hello, For some time now I cannot play music from iTunes using AirPlay. Each time when I activate AirPlay in iTunes, iTunes will hang indefinitely and I have to force-quit iTunes. It used to work a while ago, but (I think) after a system-update it no longer works. When I select one of my AirPlay devices from the system sound-output it works normally. I use macOS Sierra running on a Mac Mini Late 2012 and an Apple TV 3 and a Marantz receiver. All are up-to-date. I already had this problem in OS X 10.11 and I think in OS X 10.10. Any help is appreciated.