Disc are not showing at musicbrainz

[LyricsLover]

@Florian has to adjust the MusicBrainz.src file.

In the meantime you can do it yourself as a workaround:

[WS] MusicBrainz XML Webservice

Something changed with MB's XML output due to the inclusion of an xml header on line 1. A simple joinuntil "</metadata>" at the beginning of the album section of the script should suffice.

Open then folder %appdata%\Mp3tag\data\sources. Open the file MusicBrainz.src.
Jump to approx. line 104 (the first empty line in the ALBUM section).
Enter the above line
joinuntil "</metadata>"
save and close the file. Thats all.