I have two problems that you might not regard as bugs, but it would be nice if they could be fixed. First, when I search for "Fakebook" with the Musicbrainz web source, it returns an error because there is only one result for that search, and Musicbrainz returns the actual album page instead of a search results page. Mp3tag can't parse the "search results", and it returns an error. If there was some way, either in Mp3tag or the web source script, to check to see if this case occurs and if so, jump to the "album" parser, that would fix the problem.
Another problem I've encountered is after searching for an album (also with Musicbrainz), then selecting the album I'm looking for and clicking Ok, I sometimes get a bunch of ""s in the album window because I'm assuming Mp3tag didn't get the full HTML to parse, or maybe it times out. It usually works after I try using the web source again, so it's not a problem with the parser, or any specific album. Something is happening where the parser isn't able to work properly, and it would be nice to have a "Retry" button (that re-requests the album page) on this window too.