I have never had any luck with RAOP or Stream2Ip from Ubuntu 12.04 or 13.04 to my airport express 2nd generation.
In pulseaudio the airplay device either discovered by RAOP in paprefs or connected to by stream2ip appears and is selectable. However, when I start to play audio from VLC or Rhythmbox the players just sit there. The play button is "pressed" and the pause icon appears but the track doesn't start playing it just 'sits there'. No audio at all. If I change the output back to local speakers then the track starts playing.
It's frustrating to say the least, no one else seems to report this issue.
How can I debug what is going awry?