Where does the "auto-tag" function in the Tag Editor get its data? It looks like an amalgam of the various auto-tag functions. I have been testing it with songs that seem like they should be pretty easy to identify, and most of them have returned with no changes. One (out of about 10 so far) came up with a new genre tag, but that's it.
Edit: today, it's coming back with the message "web service failed with error", but that wasn't happening previously.