Typing CTRL-f or CMD-f usually produces a "find/replace" box, which works. But then it switches to a "search" box up in the menu bar area, which does not work. If I have two instances of Acrobat running (which I do to compare edited documents side by side) and close one of them, the "find/replace" box disappears and the nonfunctioning "search" box appears. It wouldn't be so annoying if the search box actually functioned, but it does not.