I'm running two Tv's and two ATV's. I'm using a Imac with the latest version of Yosemite. I have purchased the latest version of Beamer. My problem is this: On one Tv; everything works great running Beamer to stream a movie from my Imac. On the other Tv; I get sound but no audio trying to stream the same movie. Sound does work through the ATV if I play some other app on my ATV. If I use just Airplay to stream the movie with VLC; I get audio but no video. What could the problem be?