There's supposed to be an MP3 tag editor that you can access thru the viewer pane? I don't seem to have it. When I try to do this, I get a QuickTime logo and then it plays the song. When I check the Preferences > Viewer > View Plugins section, there's no MP3 plugin there. Though I read it's built-in so perhaps it should be shown there... but I don't see anyway to tell the viewer pane to go back to the mp3 tag editor if it's is indeed on here somewhere.