I believe that there is still a bug. If I reboot when a filter has been applied , the active playlist remains as it was (reduced to whatever number by the filter). This is the same behaviour as Beta11.

The problem is that if I select any further playlists after the reboot, the filter selected has been lost and is not applied.

Unless I misunderstand how it should work, this is the bug, because however many different playlists I select without rebooting, the active filter is applied to all of them.