Back a few weeks ago, we detailed a small and unique problem when you tried to stream music from two Zune devices, serially: Basically you would pause music on one device e.g. your phone and then you would try to stream it on your Xbox. While this was supported, it would result in an error only solvable by rebooting your phone.
Microsoft has now responded to the problem by adding a small note on the Zune how-to on their site, which shows how to get around the streaming error:
If you have a Zune Pass, keep in mind that you can play streaming music on only one device at a time. (For example, you can't simultaneously play Zune Marketplace streams on your phone and your PC.) In certain circumstances, Zune Marketplace might think you're still playing a stream on your phone when you've stopped playback and temporarily block you from playing streams on your PC. If you encounter this problem on your PC (sometimes identified as streaming error C101A9CA), go back to your phone and play something that isn't streamed (for example, a song that you ripped from a CD or bought from Zune Marketplace). Then go back to your PC and try playing the stream again.
Seems easy enough to us and according to Steve M who sent us the tip, it works just fine. Thanks, Steve.