User blog comment:Rupert Giles/Introducing Updated Global Navigation/@comment-1411998-20140928171250

Bug report: when you click "show changes" while previewing your edit, the bar covers the close button and you're unable to close the show changes screen. Another proof that the current bar is too big. I don't know if this happen on different resolutions than mine, but remember that not everyone uses 1920x1080 laptop screen.