Ok, so I'm in Theater View, Audio. I have a custom list field called Artists to allow me to see multiple entries in the Artist field. This works fine, so if I have a track with the Artist field of "Tom Jones: The Cardigans", and I have a view which starts with a top level of Artists, I see entries for both Tom Jones, and The Cardigans. Excellent, so far so good.
The View then has a second level of Album. Again this is working well, and all albums are shown, as well as the "All Albums" item. I can query each of the individual albums, and the contents are shown.
BUT, if there is more than one album, and I select "All Albums", only some of the tracks area shown. Specifically, any track where the Artist name is not the only item in the Artists tag is ignored.
For example,
If I have 2 albums containing tracks by Tom Jones, and one of the tracks has an Artist tag of Tom Jones; The Cardigans
Using my Artists/Albums query above, and selecting Tom Jone, I get
All Albums (2)
Album 1
Album 2
If I select Album 2 (containing the Tom Jones; The Cardigans track) I can see all the tracks on the Album
If i select All Albums, all of the tracks on Album 1 are listed, and all of the tracks on Album 2, EXCEPT the one featuring the Cardigans.
If all of the tracks on an album are multiple artists, none appear on the All Albums list, but the Albuim itself is still shown, and counted under the all albums item.
Sorry if this is a bit detailed