No artist & No album in some songs

I am having a problem with some songs in the Logitech server not showing the artist and album name. I'm using iTunes 11.0.1 and using its files for the Logitech server and my 3 squeeze boxes.

I was using Logitech server 7.7.2. I clear all files and rescanned everything with no success. I reloaded the 7.6.1 with the same results. I deleted and recreated all the playlists in iTunes to then rescan everything again and still the same.

All the information shows fine in iTunes but the Logitech server is missing those to fields in some songs (not in all).

Any ideas what can I do or try?