I'm not 100% sure if this is a defect or expected behavior. I have two music library tabs pinned for the same library: Music and Latest Added. Both are in Album Covers view, but Music is sorted by AlbumArtist+Year+Album and Latest Added is in Date Added (descending) order.
Once I set the orders in both tabs all works perfectly as long as MB is running. However, once MB is restarted both tabs are in the same order - whichever one was last set.
This is probably a little more important to me than most users as I'm working on controlling MB with a FLIRC and Harmony remote. Switching tabs is easy with the Harmony, but I don't think there's any easy way to access the sort order context menu, so it would be really nice if the sort order was remembered correctly in each tab.
This is with MB 3.1.6590.