Thanks. It took a wonderful lunch with my wife, to celebrate her upcoming birthday (she will be teaching on the day), to, after many times of staring at the PWM screen, find the misspelling of "Labyrinth."
I quite suspected that I'd made an error, but as I could not find it, well, that engendered my starting this thread, partially to make up for the extreme lack of traffic here. (I also have a bridge for sale if you buy that excuse; the cost of that excuse is a mere minus $0.00000...).
Site is a bit odd: As soon as I fixed the URL, I brought up the page, clicked on "Log on," which, as PWM was now doing what I wanted it to do, not what I had told it to do, promptly told me that the page I wanted no longer existed; no log-in error, just no log-in, so I clicked on that page's log-in, was logged it.
The text of this message above is intentionally "labyrinthish."