The MU site changed the link it uses for their series, it no longer looks like"http://www.mangaupdates.com/series.html?id=*", but rather "https://www.mangaupdates.com/series/xlb5p1i/jin", so the script does not execute on the correct page any more.
This is fixed by adding "http://www.mangaupdates.com/series/*/*" and "https://www.mangaupdates.com/series/*/*" to you user includes.
The MU site changed the link it uses for their series, it no longer looks like"http://www.mangaupdates.com/series.html?id=*", but rather "https://www.mangaupdates.com/series/xlb5p1i/jin", so the script does not execute on the correct page any more.
This is fixed by adding "http://www.mangaupdates.com/series/*/*" and "https://www.mangaupdates.com/series/*/*" to you user includes.