Here is what I do:
1. On my MacPro, launch browser, go to YouTube, play a video, select AirPlay (AppleTV), hit full-screen on YouTube video
2. Over on my AppleTV .. I used to then be able to watch the video in full-screen mode on my TV.
Since updating Yosemite this week to El Capitan, all I get now is the audio and a black screen (with a frozen cursor) on my TV
Is anyone else seeing this?
(ps I use Wifi to connect the AppleTV to the network and wired connection for the MacPro)
Mac Pro, OS X Mavericks (10.9.3), 6 core, 1TB flash, 32GB ram