Get rid of Adobe Media Encoder.
It's funny how the subtitle for AME is "Quickly output video files for virtually any screen" because there is nothing "quick" about AME. It's slow and clunky and it feels like something from the pre internet age. If it works at all. My workflow for posting a fun daily animation is spend a couple hours animating and then spending the next two days troubleshooting how to get it out of the box. Seriously, I'm so glad that you added prores to AE but it's overkill if you just want to play your file. Just add back h.264 movs. You say it's a dead codec but people still need it. Instagram says to use it for crissakes. Get rid of this piece of garbage and when you update something, quit rushing it out. I'm super tired of getting updates that break everything. Just stop updating unless it's necessary. You're effing with my livelyhood and my sanity here.
Antoine (Autokroma.com) commented
I agree, that's why I created AfterCodecs