Hi. I just want to say I love the Mac app (and the others, too.) My system: media files stored on Apple Airport Extreme with external hard drive, Apple TV (4th Gen), iphone, macbook pro.
When playing shows on the Apple TV, the watched status updates on the macbook but not the other way around. When I watch an episode on the macbook, the watched status does not updated on the Apple TV (even if I make sure to cycle the sync function on both systems.)