I've been playing with other themes and it seems like this seems like a consistent issue. Only when "Games List View" is set to "Text List with Details" will it play play game music. Also I found if your playing "background Music" in the game selection, then move to the "game details"where i have it set to play music from that specific game, it will work, but then when you back out to the "Game selection" screen the music is stuck playing until you cycle away from the game altogether. I think BB is just getting confused.
On a side note, if anyone ever needs me to test something, I have a special ability in finding problems, unfortunately this isn't as helpful when it comes to my real life where I'm trying not to have so many problems lol