I just had the same problem. I tried creating a site with Site Sculptor (I really prefer site builder but you guys are trying to force us into this less functional program). One thing I discovered is that you have no input into the menu creation other than choosing a template. After creation I tried to get into the menu to edit but there was no way to enter the menu. I have created sites before can could reenter the menu but not with this. So I deleted the existing menu and tried to recreate one using Menu writer. At that point it just sits there and does not initialize the menu.
Okay I figured it out, I didn't realize that Site Sculptor would default to html instead of php pages even though everything done with this requires php.
