Dumb question I'm sure:

I got the over the air update (thanks!) and it seems to work, except I can't hear anything. Headphones in/out doesn't make a difference. I can see the song timers counting down, but no audio comes out. I had a similar problem with a different media player (Songbox I think it was called), and could never get it to work. The crap-tastic media player the N900 ships with will play music through the earphones and FM transmitter just fine.

Any idea what's wrong and how I can fix it?