MC 19.072, Mac OS 10.9
I have a zone configured for Airplay. Works fine except when I go to the login window. then sound stops. sound resumes if a log back in. the odd thing, or perhaps something i just don't understand about Mac/unix, is that when i go to login window, my account has a check mark next to it indicating to me that i'm still logged in. iTunes doesn't have this issue. going to the login screen only changes the screen image. It seems like either a fact of life for MC and Mac...or a bug.
in comparison, itunes continues to play.