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I use sphinx-0.4.1. When I make pickle, I saw the error message:
Traceback (most recent call last):
 File
"/is/app/grows/lib/python2.5/site-packages/Sphinx-0.4.1-py2.5.egg/sphinx/__init__.py",
line 135, in main
 app.builder.build_update()
 File
"/is/app/grows/lib/python2.5/site-packages/Sphinx-0.4.1-py2.5.egg/sphinx/builder.py",
line 202, in build_update
 'out of date' % len(to_build))
 File
"/is/app/grows/lib/python2.5/site-packages/Sphinx-0.4.1-py2.5.egg/sphinx/builder.py",
line 241, in build
 self.write(docnames, updated_docnames, method)
 File
"/is/app/grows/lib/python2.5/site-packages/Sphinx-0.4.1-py2.5.egg/sphinx/builder.py",
line 277, in write
 self.write_doc(docname, doctree)
 File
"/is/app/grows/lib/python2.5/site-packages/Sphinx-0.4.1-py2.5.egg/sphinx/builder.py",
line 459, in write_doc
 self.handle_page(docname, ctx, event_arg=doctree)
TypeError: handle_page() got an unexpected keyword argument 'event_arg'.
I inspect the class in sphinx/builder.py. 
handle_page in StandaloneHTMLBuilder is defined as "def ndle_page(self,
pagename, addctx, templatename='page.html', outfilename=None,
event_arg=None):
but handle_page in PickleHTMLBuilder is defined as "def
handle_page(self, pagename, ctx, templatename='page.html',
outfilename=None):"
the last param event_arg is missing.