When streaming from the Mac Desktop app via AirPlay on Mountain Lion to an Apple TV, when the song changes the Apple TV displays "Unknown Album", "Unknown Artist" on the screen with no cover art.
MAC OS X 10.8
Thanks for writing in, I recommend you get in touch with Apple support to resolve this issue. Airplay mirroring is an automatic OS thing that we have no control over.
This article has some troubleshooting suggestions, however, that may help: http://support.apple.com/kb/TS4215
How the heck do you use Airplay on Rdio? I didn't know it was possible.
If you Option + click on the volume control in your header (system header, not Rdio header), you will see a menu that has the option of changing audio output to airplay.
That does not work at all. Are you using a Macbook?
Are you using Mountain Lion? (This functionality is only supported on OSX). Details can be found here: http://support.apple.com/kb/HT5404