I think I found the root cause of my problem Gadzooks so I hope this helps you out.I just bought two songs in iTunes and it did it again - no art! This time it was two more tracks on a greatest hits I already bought one for from iTunes, and now the art is gone for all three tracks, except I can still get it to show if I access the original song through genres or composers. I think ios 5.1 has a problem with this.
Try looking on "filehippo.com" for the old version guysWow that's great Sonnet79. It sounds like it, yes I am converting to a lower bitrate. I might look for the previous iTunes but it's probably no longer available. I guess we wait for an update. Anyway thanks for figuring it out and posting.