I've been having some problems running matplotlib tests after installing into python3.3 on a Mac OS X 10.7.5. Build went fine, but:

pv-chem-1762:tests jgehman$ ./backend_driver.py
Traceback (most recent call last):
File "./backend_driver.py", line 25, in
import matplotlib.rcsetup as rcsetup
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/init.py", line 151, in
from matplotlib.rcsetup import (defaultParams,
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/rcsetup.py", line 20, in
from matplotlib.colors import is_color_like
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/matplotlib/colors.py", line 205, in
for k, v in cnames.items():
RuntimeError: dictionary changed size during iteration

I thought this might have something to do with a final comma in the dictionary define just above line 205, but deleting this hasn't helped.

The test does run under 3.2, however!