SLVR L7 & mp3 management

Hi there,

I have a new SLVR and have inserted a brand new 512k memory card.
When I attach the USB cable to my computer, I am able to drag and
drop correctly tagged 128kbps mp3 files into the audio directory.
However, when I access these files via the onboard Digital Audio
Player and try and view the tracks via the "artist" & "album" menus
nothing is visable. Only when I access the "songs" are all the
uploaded tracks visable. Am I doing something really silly?

Thanks in advance,

Pete