A tangent from here:
http://getmusicbee.com/forum/index.php?topic=17758.msg108415#msg108415"Display using view" "locks" the playlist to that view - if you change the default playlists view using another playlist MB wont update the "locked" playlist. The reason i put it in quotes is because you can change the locked view via the main panel but it will only affect that playlist
Since you can change views in the main panel even if the view is "locked", I think you could simplify and clarify these settings a lot. There are really only four possible permutations of "displayed fields" and "display using view":
*Default/Default
*Custom/Default
*Default/Independent
*Custom/Independent
So instead of having "displayed fields" and "display using view" as separate settings, you can turn it into one setting:
*Sync all view setting with other static playlists ("default view")
*Sync view but not fields/columns
*Use shared view/columns but choose view separately
*Don't sync any view settings with other playlists
I think that would vastly reduce unexpected results for playlist view changes. All actual view changes would be done in the main panel, and the user could see in the settings exactly how it will affect other playlists.
I really think you could reduce it to just the first and last options. If you're using custom fields, surely you don't want the whole view to change either (option 2)? And option 3 leads to "hidden" changes to views that are not in use for a particular playlist.
Added: seems like an analogous change for Auto-Playlists would be even simpler.