Come to think of it, there were some MP3's that I loaded on my CF Card that it would not play. It was just like one specific album and I remember thinking maybe it had something to do with maybe the ID3 tag or that they were possibly Variable Bit Rate. I'll look into a little, i think i remember which mp3's they were. I filled my 256 MB Card though, and those were the only ones it had problems playing, all the others were in normal MP3 format, probably from 128 kbps - 192 kbps, but not variable bit rate.