Comment 3 for bug 1470913

On 2015-07-02 18:38 (+0200), gavin wrote:
> I AM working on a dual screen set-up (…)

This report sounds like another various of the known upstream conflict of XQuartz with the Mission control settings for spaces:
* Bug #1244397 “XQuartz on OS X 10.9 and later: limited support for multi-monitor setups”
  https://bugs.launchpad.net/inkscape/+bug/1244397

Please test the workaround recommended by the main XQuartz developer:
<quote>
  2) Turn off "Displays have separate spaces" in Mission Control if you need to use X11 across multiple displays
</quote>

Proposing to link as duplicate to bug #1244397.