Microsoft Edge DVR Playback Not Working After Update

After updating to the Windows 10 Spring Creators Update, web player playback in Edge no longer seems to be working (it was working prior). I get audio but no video (the video is just the show ‘thumbnail’). Chrome playback seems fine.

My DVR server is a Synology NAS running v1.0.4 of Channels DVR.

I am seeing this in some channels too. I saw this before and @tmm fixed it.