From Wojciech Lewandowski, "Attached are modifications to GraphicsWindowWin32. By default workaround is

set to off. But could be activated/decativated via CMake as well as system
environment variable. I also modified src\osgViewer\CMakeLists.txt to turn
off this workaround by default as suggested."

include/osgViewer/api/Win32/GraphicsWindowWin32

@@ -185,6 +185,7 @@ class OSGVIEWER_EXPORT GraphicsWindowWin32 : public osgViewer::GraphicsWindow
 
         std::map<int, bool> _keyMap;
 
+        bool   _applyWorkaroundForMultimonitorMultithreadNVidiaWin32Issues;
 };
 
 }