Minor Composers - some problems I am struggling with!

[pgbj]

Sorry a further update... the log file contains this single warning...

Warning: custom value conflict for COMPOSER tag '[Minor Composers]' in file Various/McCreesh, Paul/Venetian Vespers (McCreesh, Paul) (Disc 1)/02 - Intonationi (11) d'organo, libro primo, complete (1607); Intonazione.flac
current display/sort value is 'Traditional'; new display/sort value is 'Gabrieli'

I have checked there is only one COMPOSER tag. If I remove the files, the warning just moves to another file.

It's as if the association between COMPOSER=[Minor Composers].display=Gabrieli is being maintained once for the whole library rather than once per file?

I clearly am missing something!