'Album Sort' - unexpected behaviour

[simoncn]

The "conflicting custom value" message is produced when different sort values are applied to the same tag value.

For the message you have posted, the tag value:

Beethoven - Symphonies Nos. 4 & 7

occurs in (at least) two different files, one file with the AlbumSort value:

Beethoven - Symphony No. 4 & 7 [Karajan]

and another file with the AlbumSort value:

Beethoven - Symphony No. 4 & 7

The first of these sort values is used and the second is ignored. This applies to all tag values and is needed because a tag value cannot be sorted into two different positions at the same time.

The problem with 'Beethoven - Symphony No. 9' is likely to be similar, with different AlbumSort values in different files that have this Album tag value.