I found the problem.
I have my library in iTunes, stored in Apple Lossless.
When Pono Music World creates the down sampled versions the 9600 and 44.1 lossless are stored as flacs. But, the Original 19200 was copied over as an m4a. The Pono player doesn't seem to see it.
There are two fixes. Pono Music World could convert the original to flac, or the Pono player could be fixed to recognize Apple Lossless for the original.
BTW, I have PMW set to convert to flac when it copies to the Pono, but obviously the revealer creator does it's own thing.