I have an 8 gig card in my Storm with a couple hundred .mp3 files on it. But when I launch my music/media application -- it doesn't show any of those in the media list -- and I can't figure out how to point the player towards them, or know how to make the application index them.
If I go directly to the music file, it plays fine.
I've had that as well, they didn't show up in music/media section for some reason after i had transfered them from my PC to BB, After a battery pull they then showed up ok.
If that doesn't work you can also see them by media>BB Key>explore>media card>blackberry>music