DNxHD opens in Media Encoder without Image

I've exported a 1920 x 1080 DNxHD QT from Avid Media Composer. It successfully plays in QuickTime player with picture and audio. But when I bring it into Media Encoder, I can find no setting that brings up video. I tried to transcode it to H.264 and  under video settings, it sees the file as 720 x 480 and at the end of the transcode, I have audio, but no video.

Any idea what I'm doing wrong?

Martin

Early 2009 Nehalem MacPro4,1, 2 X 2.6 GHz Quad-Core

OS High Sierra 10.13.6

Samsung 850 EVO 1 TB system drive

32 GB RAM

ATI Radeon HD 4870 GRFX Card

Blackmagic Intensity Pro 4K, Driver: 10.11.4

Avid Media Composer v. 2018.11.0

Adobe Premiere Pro CC 2019 v. 13.0.3 (Build 9)

Adobe Media Encoder CC v. 13.0.2.39