I am running Mac OSX 10.13.6 on an iMac, 32GB RAM.
I recently went to AME 2019. I export a QT reference from Avid.
Bringing it into AME, it does not see the video, only shows the audio.
I have re-exported the ref file from Avid, checking all settings.
The file plays back fine. The only thing different is the AME version. All was fine previously,
on AME CC 2015.3. I am also unable to open 2015.3 now,
after uninstalling 2019, which I thought perhaps was causing a conflict.
I have replied to this on your Creative Cow post:
With effect from ver 2018, AME no longer supports QT ref files. Ver 2017 still offers support. See here:
I think support for referencing movies was dropped entirely in the switch from QuickTime to AV Foundation Frameworks. There are a lot of great features from the 32-bit version of QuickTime that are missed.