These threads/posts should shed some light on this issue:
http://forums.sandisk.com/t5/Sansa-Fuze/Sansa-Fuze/m-p/218318/highlight/true#M1303
http://forums.sandisk.com/t5/Sansa-Fuze/Only-shows-ten-songs/m-p/217524/highlight/true#M1214
These threads/posts should shed some light on this issue:
http://forums.sandisk.com/t5/Sansa-Fuze/Sansa-Fuze/m-p/218318/highlight/true#M1303
http://forums.sandisk.com/t5/Sansa-Fuze/Only-shows-ten-songs/m-p/217524/highlight/true#M1214