Also ( tips ) -
As luck would have it though, when I tried to play them through Explorer, I got the old "Making Playlist/Playlist Empty" problem that they had previously eradicated from my system with a couple of download tweaks. When I reported this problem, he said that I needed to change a setting on my Reference player, and emailed me a photo of the following screen: Home>Setup>Miscellaneous>File Browser. The setting that needed to be changed was the second one from the top: ""OK" Button on file". It needed to be changed from "Generate Playlist" to "Play single file". I did change that setting (and the one right under it: ""Play" button on file"), but by then I had already deleted the two .mkv files, as I was still ripping in other movies and didn't want the system to identify those two versions of movies that were already established on the system while Identifying the new content that I was introducing. Changing those two settings to "Play single file" has not had any effect on anything else so far, that I can tell.
My point in all this, aside from possibly helping anyone else who may be having the same issue, is that Zappiti Software Support is, at least for the time being, still alive and well and doing their best for us under what must be really tough circumstances for them.