Read http://forums.cnet.com/5208-7595_102-0.html?forumID=71&threadID=277417&messageID=2663683 and note the issue with CBR MP3 files. Yup, they don't play on everything.
I have converted music files to MP3 and put on 3 different devices and they all do not play correctly on the players, but they sound fine when listening on the computer. The players are a Sansa & Phillips MP3 player and a Poloroid digital photo frame that plays MP3 files. The music kind of "skips". I have been using Microsoft Plus Audio converter. What is the problem? Please help!