Comment 4 for bug 1244397

Same recommendation wrt to XQuartz & Mavericks mentioned on the xquartz-dev mailing list:
<quote>
  1) Re-install after updating.
  2) Turn off "Displays have separate spaces" in Mission Control if you need to use X11 across multiple displays
</quote>
<https://lists.macosforge.org/pipermail/xquartz-dev/2013-October/003733.html>