Cover Art and media streaming to PS3

Hi

Apologies if this has been asked and answered elsewhere, I couldnt find when searching.

I am using TVersity to stream to my PS3 over wireless and have been busy using Mp3Tag to add cover art to my MP3 collection so it should display on my PS3.
It seems to display for some but not others. The cover art is all tagged under type "Front Cover"
Any assistance please?

Thanks a lot

Nick