Hi. After Upgrading to El Capitan, Airplay of videos created with Imovie to my AppleTV 2nd gen and other airplay devices (FireTV Stick with AirReceiver app) fails. I found a workaround using display cloning to the devices. Everything worked well before the upgrade. Any idea how to troubleshoot/fix this?
iMac, OS X Yosemite (10.10), AppStore