I installed pythonOCC from master (3/28/2013) using a OCE 0.12 which I compiled 
from sources.  There were some issues with linking at one project so I had to 
comment in Sketcher.i code
/*%nodefaultctor Sketcher_GUI;...
%extend Sketcher_GUI {  void _kill_pointed() {          delete $self;   }};*/
And also I had to fix main cmake file as it was not pointing at the right 
source location from which it is supposed to install into OCC folder.  
Issuing python test_all.py goes up to test_through_sections 
(topology_building_unittest.TestTopologyBuilding) ... Test: through 
sectionsthen Python crashes.  However, what is more disturbing is that running 
python geometry_demos.py  gives
 ###### 3D rendering pipe initialisation #####Display3d class initialization 
starting ...WNT Graphic device created.WNT window created.Viewer 
created.Traceback (most recent call last):  File "geometry_demos.py", line 70, 
in <module>    display, start_display, add_menu, add_function_to_menu = 
init_display()  File "d:\Python26\lib\site-packages\OCC\Display\SimpleGui.py", 
line 121, in init_display    win.canva.InitDriver()  File 
"d:\Python26\lib\site-packages\OCC\Display\wxDisplay.py", line 151, in 
InitDriver    self._display.Create()  File 
"d:\Python26\lib\site-packages\OCC\Display\OCCViewer.py", line 84, in Create    
self.Init(self._window_handle)RuntimeError: 
Aspect_GraphicDeviceDefinitionErrorOpenGl_Window::CreateWindow: SetPixelFormat 
failed. Error code: 2000
Is this some kind of incompatibility with Windows 7? 

                                          
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