Hi,
i know that 403 is a security error, but if i create a new page (and edit it) i can save without problems.
The problem is located only in imported demo page and in “Enfold” area.
Have you try to login with user and password and try to change setting in Enfold area?
If you want i create a page “test page”, if you edit and save it, you can save without problems.
In anyone page imported you cannot save. (403 error)

thanks