You might want to look into this. Icon in the taskbar clones itself endlessly in the tray. Seems to happen on the receiver only.
Windows 7 64bit Home Premium.
EDIT: Happens while receiving, turn off sending on the other machine stops the cloning.
EDIT2 : On the 'sender' machine AB turns the volume on off on off every second. Creative Xi-Fi USB there.
EDIT3: Tried another machine as sender, same result. Audio is turned on/off forever. Needless to say no sound at all at the receiver...
Bought too soon, I guess. But as this is beta I hope the issues will be handled soon.
Network is gigabit here, just for info.