OK, maybe I spoke to soon. It works perfectly if I choose "All Keys" or "Single Key" as the item type. But if I choose "Row of Keys", I get various results. For function keys, only F1 thru F7 light up. For Numbers (1-0) or, 1-5 light up. For numbers (0-9) the 0 and 1-4 light up. For QWERTYUIOP, only QWERTY light up. (For the rest of the rows, only the leftmost five or six light up).
But at least I can see it's working, and for now I'm using "all keys." Thanks again.