I am also getting this annoying behavior. The stupid thing is, it didn't used to do this! I am absolutely positive that it did not. It is just something that has started to happen very recently. I think it stharted happening somewhere around the time I switched from using a VGA cable from the computer to the HDTV, to an HDMI cable from the computer to the HDTV. This also happens on two separate machines. They are both using VMC x64 edition, with HDMI cables to HDTV's. What happens is that I will play something under the Video Library, and once it's done, I hit done. If I then go back to the main page, and turn off the TV, the next time I turn on the TV, the movie begins to play in the background. Or if I minimize VMC or something like that. It does NOT happen when watching the files under Recorded TV. In fact, when I am in this situation, I have to go to recorded TV, start playing something there, stop it, and the Now Playing, goes away. It's really strange. I don't see how this can be normal behavior as that one person wrote, especially since it didn't used to do that!
Is there something strange about using an HDMI cable that causes it, or something completely different?