Airplaying from my Windows 8 64-bit laptop to my ATV 3 was really temperamental - sometimes my library would display, other times it wouldn't. When the ATV saw my computer, sometimes it would stream a TV show from my library in a second or so, sometimes it would take 3 or 4 minutes to buffer enough to start (even with songs!). OK - maybe not an Airplay problem, but a problem nonetheless. With iTunes 18.104.22.168 everything works as advertised. The ATV sees my computer every time. My library streams in seconds. And they have indeed improved the wireless device detection and syncing. I had given up on that, but iTunes sees my iPhone and iPad consistently now. Happy camper here.