It appears that iTunes is now using the "PRIV" frame to embed the cover art using ID3v2 instead of the standard "APIC" frame. This leads to some issues, see this post. Any ideas if Mp3Tag can copy/move the contents of the PRIV frame into the APIC frame?
PS: Mp3Tag is absolutely brilliant! It's probably one of the best truly free closed source apps that I have seen. Any chances you can create an Amazon.co.uk wish list? I get stucked with Amazon.de as I don't know much German.