I'll open a support ticket for you and have someone look into it with you. I'm not sure exactly what it is... I can't tell if you are adding a page through the CMS, but if you are then it wouldn't update the navigation menu automatically.
You would have to manually update the menu.php file and create the associated page in Dreamweaver to display that new content first.
In order to be able to explain this to you effectively I think a support incident and phone call are probably the best form of resolution.