Recently added Sonos to mac os 10.7.5. Sonos software connects to my Play3 and controller is working but I can't add music library. Under "manage", it won't even highlight and it doesn't show up in preferences. In my system prefs, I have selected file sharing on, window sharing on, share files & folders using SMB on. But I still can't add the music library. file sharing is on in itunes. suggestions?