When I'm storyboarding in the SBE I can't use Ctrl+Z anymore because it will reset the order of all my SBed objects
example:
edit: it seems this also happens when you hit Ctrl+Z even when you aren't in the design tab
example:
Open a heavy SBed map in editor (I took siriru's Hiiro Gekka Kyousai no Zetsu)
go to design tab
now it looks like this: http://osu.ppy.sh/ss/4735
Move a single SB image / object
hit Ctrl+Z
now it looks like this: http://osu.ppy.sh/ss/4737
edit: it seems this also happens when you hit Ctrl+Z even when you aren't in the design tab