This problem has come up several times before. It seems to me like it's either an outright bug in the code or else it's a design flaw where the code is broken as designed. I hope that the problem is addressed sometime in the near future, like maybe about six months after RM8 is released.
I agree Jerry. You are able to edit pretty much everything except up date the home page image from the site settings. Makes sense to allow image updates too I would have thought.