We were watching the Harry Potter parody "A very Potter Musical" which was a play put on by some University of Michigan students. It has been posted on You Tube in about 20 separate videos. The first one:
http://www.youtube.com/watch?v=wmwM_AKeMCk
When we attempted to watch it on a laptop connected by HDMI cable to the receiver, the audio kept cutting out.
Then I realized the format was set to DTS. I reset it to Source Direct and the audio problems went away.