I just bought a copy of Movie Edit Pro Plus from the Windows Store (Version 16.0.2.48) for my company.  I imported an existing H.264 MP4 video that I wanted to trim, and now just want to export back to the same format (original video was created in another program several years ago).  I have tried various settings (with/without hardware acceleration, etc) and every time I export a movie using MPEG-4, the result is just a blank video (black screen).  However, if I export to HEVC, then I get video, but there is a lot of judder.

I have also matched the resolution and framerate for exporting to the original video.  1280x720, 29.97 fps

I'm not sure what the issue is.  Anybody familiar with this issue?

Running on a Surface Book (i7, 8GB RAM, Nvidia 940m'ish GPU)

EDIT

I found a similar post here:

https://www.magix.info/uk/forum/export-as-mpeg4-but-no-video-in-mep2016--1146864/

Seems like the problem is that even though Movie Edit Pro is able to import the video, it doesn't like some videos when exporting to MP4.  I tried importing some newer MP4 video from a different source and it worked without issue exporting back to MP4.