Thanks BlueMeanie. I have already tried reformatting the USB stick, as suggested by another forum member a couple of days ago, but I might do it again later, more out of curiosity than any real hope that it will achieve anything! The system is definitely FAT 32 and the files are definitely mp3, and the stick works everywhere except in the Captur!I have just been out to buy another 8 Gb stick and synched it with my music files. It is working perfectly in the car! So, in one sense it is problem solved, but in another I am left baffled as to why the Captur can find nothing on the original stick.