I regularly share the video in my iTunes library (on an iMac) to the Apple TV. However, for some reason, since the last update, all of my computer iTunes videos are set to play on the Apple TV. This can be easily switched via the icon in the play bar....but it has to be done with every single video (and is accompanied by the spinning beach ball for awhile!).
Any idea how I can convert the settings back so that iTunes video defaults to play on my Computer?
Look at the airplay icon beside the volume switch. Make sure that the computer is default when you aren't playing anything. Also, select "multiple" and make sure that computer has the green circle with checkmark in it.