Tabs have 3 different orders within CB > Tab Management. 1 is for profile view, 1 is for profile edit, and 1 is for registration. To use the mass reorder features you need to be sure the list is ordered by that order first. It defaults to "Profile Order ascending", which if changed to "Edit Order ascending" will let you mass edit the tabs order for profile edit (you'll notice the input field under Editor Order column is now usable).