Has anyone a working Airplay (audio) setup with OS 10.8/10.9, iTunes 10/11 and any Denon/Marantz AV receiver with native Airplay support? Mine worked perfectly, but stopped working about a year ago under OS 10.7 oder 10.8 and some iTunes 10 version - and no OS / iTunes / firmware update has restored it since then. My setup Airport Extreme as router - the network is wired (gigabit switch), wireless only for wireless devices such as iPhone Mac Pro (2008), OS 10.9, iTunes 11.1.3 2x Apple TVs 3rd gen Denon 3312 AV receiver Marantz 5006 AV receiver iPhone 5s All devices have the latest software/firmware. I used to use iTunes Airplay music streaming to my AV receivers, which support Airplay natively - I selected the receivers for this feature and switched from Onkyo receivers. Airplay music streaming from iTunes to the receivers worked perfectly, until it suddenly stopped working sometime a year ago - which means, the audio stream will simply stop playing after a few minutes, and the receiver needs a reset to work again als Airplay speaker. It curiously still worked wirelessly from iOS devices - which was a workaround, but also stopped working in the beforementioned manner - I guess since iOS 7. On the same network Airplay audio streaming to the Apple TVs works without a problem. It seems to me that Apple has something changed in the AirPlay protocol whichs breaks compatibility with (licensed) 3rd party Airplay audio devices. According to some forum articles there was a problem with IPv6 and Airplay streaming and the advice was given to deactivate IPv6 in network settings (which was possible via GUI in OS 10.6 but requires a terminal command in OS 10.7 upwards) - this helped initially with iTunes 10, but doesn't make a difference in iTunes 11. Since the problem exists for over a year my hopes at Apple fixing it are gone... It's really frustrating, since it used to work wonderfully - it's the exact opposite of the Apple experience: it simply does not work (anymore). Has anyone further insight?