Display/File tag problem

[Bane]

I am not able to get my Kenwood headunit/phatbox combination to correctly display track title, album title, artist, ect. as separate items. My unit displays "unknown artist -- unknown track filename" It even does this for the music sampler incuded with the unit. Anyone have any ides how to fix this? Am I right in thinking that I should be able to select through the different categories?

Thanks