Comment #19 on issue 1916 by [email protected]: Plotting fails: Window initialization failed: Unable to share contexts
http://code.google.com/p/sympy/issues/detail?id=1916
found the fix. 1) that os.environ call needs to occur before the import, at least in both of my copies of win7. Next, to make this permanent, one can go into sympy/thirdparty/pyglet/pyglet (make sure you go into the second pyglet directory) and edit the __init__.py file look for shadow_window=True and change it to False. Plot() should work after this.
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