Originally Posted by aeneas01
did you ever resolve this? i'm having the issue excpet my entire screen flashes green... like you i own a 4242 with 18g inputs, apple tv 4k, bjc active cable....
I have since done three things which have improved my AppleTV experience no end:
1) replaced every cable with 2m or more Monoprice certified premium leads.
2) changed AppleTV UI to 4k24p SDR which means least possible number of refresh changes on starting content
3) programmed my Harmony startup sequence for the AppleTV to send the AppleTV a reset command on activity startup. This means it takes a few more seconds for the system to get into AppleTV mode, but I don't seem to have as many odd issues any more with the box complaining about HDCP issues and the like.
Even with the above mitigation the AppleTV4k experience still isn't brilliant though, which is still a source of disappointment for me. Watching some Dolby Vision content no longer causes big luma changes thanks to the dynamic tone mapping - meaning the bogus, changing "static" metadata can be ignored - but there is still at least one outstanding issue which is that you will get occasional audio dropped samples which are coincident with the Apple TV sending out bogus metadata changes. Tis can range from every 30s to every 5mins to never, it is content dependent. The samples are dropped with all audio formats but particularly noticeable with content with Dolby Atmos as the MAT output format if corrupted causes my AVR to click and pop.
This appears from discussion with Lumagen support to be an issue with the input chip microcode; the vendor did have an update which fixed it, but it was worse for other reasons of input reliability. Of course I'm sympathetic to that situation, and the issue does arise from Apple doing something a bit naughty in their output; but it does mean that for HDR content playback it is hard to recommend using the AppleTV via a Lumagen processor.