A function to get the font properties angle is missing in the EMF backend of matplotlib 0.99.1. This patch has to be applied in addition to patch https://sourceforge.net/tracker/index.php?func=detail&aid=2853659&group_id=80706&atid=560722 (is already applied to svn HEAD r7706) to fix the problem.
You can find the patch at
JDH: None of the core mpl developers are
win32 users, so we will defer to you as to what is best for this backend.
No problem, but you can test the EMF backend also without win32, OpenOffice supports EMF pictures.