Page not found under global navigation
after a crazy long I came to post these article and I promise to keep posting on my lovely SharePoint and now I completely shifted to 2013. Within the links in global navigation Page not found- appears when editing links but this is hidden by default. This occupies space when your navigation has fixed width you got real trouble. To disappear Page not found- you simply on check "Show Pages" in navigation settings, but deselect "Show Pages" has causes to no new pages are not added to navigation by default and also it removes all pages links those are added by default in navigation. So keep in mind and look all navigational links before going to deselect these option.