I have a strange problem with Safari full screen mode and the tab bar always displayed, it does "not update" alone. In fact when I, for example, two tabs and I created a third (by clicking a link) it does not appear immediately. I have to either click on the tab bar and pretend to move one, either click the "Naviagtion tabs" for bar tabs emtte update.
A little heavy, huh?
All my software are up to date and even reinstalled recently, but the problem is still present.