Any ideas why this isn't working?

This usually occurs because the server can't get to the music listed in its database. Are the files on a network drive? Did you reconnect the drive correctly?

You could look here and see if you can successfully stream the tunes on your local PC. You don't need WinAmp, just IE. It won't play the tunes, but you'll either get binary gibberish in IE (it's working) or an error message (it's not).