Imshow was moved to using GPU callbacks for image display.  This caused a bug where the node was deleted, and thus memory deallocated but the callback wasn't aware of this.  The fix was to disable the node in the main thread, then wait for any callbacks to clear.  Afterwhich the node can safely be deleted.
Imshow was moved to using GPU callbacks for image display.  This caused
a bug where the node was deleted, and thus memory deallocated but the
callback wasn't aware of this.  The fix was to disable the node in the
main thread, then wait for any callbacks to clear.  Afterwhich the node
can safely be deleted.

dtmoodie/EagleEye,dtmoodie/EagleEye,dtmoodie/EagleEye