LW 5's id3 tag reading is lacking. It has problems reading the tags. LW 4's abilities were much better. I'm sure LW 5 will improve upon this later in year, but I suffer the same problem with half my library from iTunes lacking either artist or album. And adding information via LW 5 can only be done one file at a time. LW 4 could add information to multiple files at a time.

Also, iTunes does not always tag music songs properly. iTunes by default tags using ID3v2.2 though it does have the option to tag at higher than this if you know how to do it. However I prefer using a 3rd party tagger to tag at ID3v2.3 or ID3v2.4 depending on how much information I wish to add.

You could always downgrade to LW 4 if this issue annoys you too much. Lime Wire » Download Out-Of-Date Installers