User blog comment:Sarah Manley/Try the New Wikia Editor/@comment-5473581-20110830020204/@comment-5473581-20110830022654

In addition to this, when using the "page down" button to scroll the edit area, the summary/preview/publish bar is moved slightly upwards so as to be partially covered by the blue title bar above it. (This only occurs if there is a scroll bar in the edit area.)

And it does not re-appear by pressing "page up", or by using the mouse scrollwheel, the only way of getting the page to show it again is by pressing the mouse button down in the edit box to being selecting text and move the mouse cursor to the top of the screen.