Not seeing video playback

Having recently upgraded my Asus Chrombox from OpenELEC to LibreELEC 8.0.0, with Kodi 17.0, I find that I don’t see video playback any more.

Specifically, after I seemed to get the U/I all working and displaying correctly, I find that when I start to play a video (Movie, TV show, I’ve tried a few, so I assume it’s not based on the specifics of a video file [format]), the play icon appears in the U/I, but nothing else appears. I can head the sound of the video, at least the first few seconds worth, then it seems to stop. I can interact successfully with the U/I, stop the video, etc. But I never _see_ it.

This is likely specific to my chrome box, so let me know if I should try a different forum…