You have made changes to the current runlevel Do you want to save the changes? No Yes A) No/Yes is bad B) Need a cancel here, especially since the user probably wasn't expecting that menu item to require them to save changes. See section about Save confirmation alerts: http://developer.gnome.org/projects/gup/hig/1.0/windows.html#alerts-confirmation For the correct buttons.
Fixed in 8.5.1 in Rawhide.