MinimServer doesnt like multivalues for AlbumArtist

[simoncn]

ID3v2.3 has limited support for multiple values. The TCOM, TEXT, TOPE and TPE1 frames can have multiple values separated by a "/" character. MinimServer maps these frames to COMPOSER, LYRICIST, ORIGINALARTIST and ARTIST. The TOLY frame also supports "/" as a separator but this frame is not mapped by MinimServer.

As your files are tagged with ARTISTS rather than ARTIST, this is a TXXX frame and the special treatment of "/" in ID3v2.3 does not apply. As Paul says, the solution is to move up to ID3v2.4.