Things to try, F-11 should bring all the menus back. Otherwise try the tools menu (ctrl-1, ctrl-2...ctrl-5)

I have a memory of an earlier version getting stuck in full screen. So make sure you are using the latest 3.0.0616 (menu -- help-about)
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-------------------- With no known exceptions, the cost of internal trust, efficiency and loyalty is external distrust. The "us against them" is not an optional feature, if there were some way to preserve the loyalties and the tremendous benefits of internal trust without paying the cost of the ferocious xenophobia, then that would be just what we want to do. But we don't know how to do that. --Daniel Dennett http://www.abc.net.au/rn/allinthemind/stories/2007/1812733.htm