8 GB Fuze not recognizing songs

I realized that some of the songs weren’t in mp3 format, but there was one that just wouldn’t show up. However, after doing the ID3 tag, it showed up! Weird, but it worked! Also, I’m not really sure if I have the latest firmware, because the firmware software (and pretty much all the software that came with the Fuze) doesn’t work on Mac. :\ Bummer.