I did finally use the shut down command, after I couldn't get it to respond to the pen at all. I turned it back on, hooked it up to my iMac, and removed all of the books on it via
Calibre. Then I added two books, and opened one, then put the unit to sleep.
After waking it, the next page button would not work again. Neither did the home button. After pushing a few more random buttons, the thing finally responded and flashed here, there and everywhere. It finally landed on the library, where I opened the same book up, and now the pages are turning.
It really ought not be this much trouble.