I got a similar problem, but in my case when I moved the mouse cursor to the top of the screen in full screen mode (above the title area), the tool bar appeared. The problem I encounter at that point is exiting out of that screen. When I click the Exit fullscreen link, nothing happens. Also, the Visual and HTML tabs do nothing in full screen mode. The only way to exit out of full screen is to hit the back button, which takes me to the page I was on before the widgets page.
