Win 7, make html, 2.7 and 3.3. writing output... [ 20%] howto/advocacy Exception occurred: File "F:\Python\dev\py33\Doc\tools\sphinx\environment.py", line 1063, in get_toc_for toc = self.tocs[docname].deepcopy() KeyError: 'howto/advocacy' and process stops. Since update did not change the sphinx install that worked when I last tried this (April), I presume error is in our sources rather than Sphinx.
I just did a clean doc build on 2.7 (on linux) on 2.7 head without error. Maybe you need to do a 'make clean' and rebuild? Our Makefile ought to have a target that just throws away the build dir, instead of throwing away the checked out software as well, but it doesn't. So instead of make clean you might want to try just deleting the build dir and rebuilding first.