On my Apple TV (version before the 4K version, TV OS 12.1) I routed the HDMI cable from the Apple TV to my Denon receiver and then to the tv. That worked for years for all apps. Now it doesn't for Netflix, Amazon, Vudu, And Movies Anywhere. It still works for iTunes movies. On Netflix, I get audio only for the movie itself though I get audio and video for the previews. On some of the other apps, I get an error saying that it cannot connect to the monitor with a HDCP connection (or something like that). If I connect directly to the TV, Netflix works. I haven't tested the other apps yet. So basically, either iTunes is not testing for a 'secure' connection or third party apps no longer know how to test for secure connections when the signal passes through a receiver or the Denon receiver is somehow blocking the secure connection test. Anyone else having similar issues?