There has been no change to how metadata is matched, the only change is that now instead of searching amazon directly, amazon is searched via a search engine instead. Presumably for you problem books, the search engine's top link is not to the book page but to another book.
You can get back the old behavior by customizing the amazon metadata download plugin to download from amazon's servers, but be warned that doing so might result in failures because amazon is trying to block calibre.
|