(*) OK, great: I have finally figured out how to turn off the overlay display — and at this point my PLEX playback appears to be functioning perfectly, as long as I use the Synology share folder that I created the other day (rather than the video share folder originally created by Synology).
(*) Happily for me, it doesn’t appear that I’ll have to figure out what you were prompting me to get with those directions about attaching “the XML.” I was never able to grasp what file to get nor where to get it nor how to extract “the XML,” but since all my lost PLEX functions appear to be fully restored, I guess this has become a moot point, right?
(*) Thank you so much for getting all my issues resolved!