Somebody must have mentioned this - but I cant find it.
View scheme panes only work left to right. All the items in view scheme panes should filter regardless of which item is selected first. For example, Ive got Genre/Artist/Album. Ive got a couple of Radiohead albums with two different genres assigned. If I click on Radiohead in Artist, Album compresses to show the two albums, but Genre still shows all items, not 'Radiohead genres'. If I set up Genre/Artist/Album/Genre and do the same, only the right hand genre behaves appropriately.