i have tried what you mentioned and the same thing is still happening,
i am running windows xp pro with sp3, my version of dreamweaver is cs5 and am using site sculptor 1.0.0
this is also happening on my laptop with the same issue but on there i am using windows 7 professional, same dreamweaver and same same site sculptor.
i have already tried uninstalling and reinstalling both dreamweaver and site sculptor,
infact the install on the windows 7 pc is a new and fresh install of dreamweaver and site sculptor.
has there been an update released for site sculptor as i am finding this extremely frustrating to add my menu, it is a simple menu with about 8 menu and one of them is a drop down item with 5 listing under it