After 4 years of frustration, I am giving up on both my SanDisks for audiobooks. Whatever tag is key to its mysterious sequencing, it is NOT logical, visible, alphabetical or numeric. It would certainly be useful if the mysterious ID tag that governs sequence of play were revealed; as far as I can tell, it is not. And if it is publicly available, how does one edit it to satisfy the player?
The only solution to an audiobook lover with this brand is to concatenate all the book chapters into one enormous file. That prevents the SanDisk player from screwing up the sequencing, but then you may find yourself 14/17ths of the way through War and Peace when you need to restart the file.