Marc, I think I did this. I had Virgin radio streaming on my PC/iTunes. Created a playlist called radio and drug the Virgin Radio feed into the playlist. Stopped the feed on my PC (bandwidth is limited here in Shanghai, China). I sync'd to aTV, the playlist was there as was Virgin Radio. I attempted to play Virgin radio and the screen came up like it was going to play but nothing happened... No music. Waited maybe 5+ minutes then gave up. Went back to the PC and tried it there again... No problem.
I wonder if it's a WiFi bandwidth thing... PC is wired, aTV is WiFi...
For the most part, aTV is working ok in a bandwidth-challenged environment... I also get the dropping from the device list like others do... Takes a variety of things to wake things up again...