Thanks for the suggestions -- but I found the problem, which is unusual.
I was testing on a new SD card that had several files in folder TFLD001, but the folder had not been named.
The earlier version of the program printed even though the folder had no name.
I guess the later versions only print the folders with names. This is good because it saves paper.
Anyway, when I named the folder, all was well.
Thanks again, everybody,
Walt