matplotlib/matplotlib — pull request #2144 by cgohlke (2013-06-21 19:26:44+00:00)
Title: BUG: Fix ValueError: setting an array element with a sequence

This is fixed in the master branch. It affects the matplotlib:v1.2.x branch only, not the not 1.2.1 release.
The bug was reported at http://code.google.com/p/winpython/issues/detail?id=61