Thanks for your support.
I gave it a quick run through. This time I ran it on a parent theme to eliminate extra possible css issues.
When setting it up, I added too many rows to input the videos, and was surprised that there was no way to delete the rows. It looks like once you have added a row to put media into, by golly you are then required to put media there. So I made stuff up to fill in the spaces, because it was not going to let me go any further until I filled in those required spots. (I then deleted them after the fact; but I had to search to find how to do that. (It's in the "Current Status" column)
Another thing that surprised me was that, apparently, once you have finished adding media to a gallery, you can delete entries, but you can not go back in and add any new items.
So, I ended up with 3 videos in a gallery. I entered the shortcode in the post, and when I looked at the page, there were two scrollbars, one above the other, with the text of titles and descriptions across where a player should have been... there was (or were, I was expecting one player that would play the three videos) no player to be found on the page.
In the third space there was a player placeholder saying that there was no video to display.
I realized I had designated one of the videos as Vimeo when it should have been YouTube. That's when I got my third surprise. When I went back into the plugin setup, I saw that there is no way of changing the media type once the gallery has been saved.
Well I'll save us both the time of further dissertation and just say that I have found a solution that will work for me and am going to continue to use it.
But I do appreciate your commitment to continuing to develop this plugin for the WordPress community and I hope that others will have better luck with it than I did.