glNewList ArgumentError - wrong type

Hi,

I'm using py27-opengl 3.0.1_0 and py27-opengl-accelerate 3.0.1_0 on MacOS 10.7.3 64 bit via macports.  I'm also using wxWidgets-devel 2.9.3_0+sdl if that's relevant.  
I've installed the wxgui component of gnuradio and am getting the following error when I try and use an openGL widget:

Traceback (most recent call last):
  File "/opt/local/lib/python2.7/site-packages/gnuradio/wxgui/plotter/plotter_base.py", line 187, in _on_paint
    for fcn in self._draw_fcns: fcn[1]()
  File "/opt/local/lib/python2.7/site-packages/gnuradio/wxgui/plotter/plotter_base.py", line 58, in draw
    GL.glNewList(self._grid_compiled_list_id, GL.GL_COMPILE)
ctypes.ArgumentError: argument 1: <type 'exceptions.TypeError'>: wrong type

The code is at http://pastebin.com/ezLmgYv2

Thanks,

Steven.

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