Comment 4 for bug 915761

This issue persists for me as well, when compiled on my 10.9.x system. The following patch to the overlay.mm linked in the referenced instructions fixes the issue for me.

--- overlay.mm.orig 2011-12-23 13:05:06.000000000 -0800
+++ overlay.mm 2014-07-01 16:54:45.000000000 -0700
@@ -69,7 +69,7 @@
     m_window = dc->GetWindow();
  m_overlayWindow = m_window->MacGetTopLevelWindowRef();

- NSRect box = [m_overlayWindow frame];
+ NSRect box = [m_overlayWindow convertRectFromScreen:[m_overlayWindow frame]];

  if( [m_overlayWindow isVisible] )
  {
@@ -107,7 +107,7 @@
     // todo : don't dispose, only hide and reposition on next run
     if (m_overlayWindow && [m_overlayWindow isVisible])
     {
- NSRect box = [m_overlayWindow frame];
+ NSRect box = [m_overlayWindow convertRectFromScreen:[m_overlayWindow frame]];

   [m_overlayWindow discardCachedImage];
   [m_overlayWindow cacheImageInRect:box];