I am having the same problem I syncronized all of the files the same way but some show up and some don’t. Also, I’m finding the service from Sandisk to be very poor. There is nothing that I have found in the manual to solve this problem and I just got this player and it already isn’t working and no one has a solution. If anyone has any clue I’d be very appriciative.
I bought my e140 three years ago, and I never had that problem. I use windows explorer to add the files and the player works perfectly. The files need to be in mp3 format.