test_pcolormesh hangs #1609

Hi,

I am running matplotlib-1.2.0.tar.gz

When running the tests test_pcolormesh hangs. The relevent part of the test is:

xldn0553vdap:build% python -c "import matplotlib; matplotlib.test(verbosity=2)"
matplotlib.tests.test_artist.test_collection_transform_of_none.test ... ok
matplotlib.tests.test_artist.test_patch_transform_of_none.test ... ok
matplotlib.tests.test_axes.test_arc_ellipse.test ... ok
matplotlib.tests.test_axes.test_arc_ellipse.test ... ok
matplotlib.tests.test_axes.test_arc_ellipse.test ... KNOWNFAIL: Cannot compare svg files on this system
cut test for brevity
matplotlib.tests.test_axes.test_nonfinite_limits.test ... KNOWNFAIL: Cannot compare svg files on this system
matplotlib.tests.test_axes.test_pcolormesh.test ... ok
matplotlib.tests.test_axes.test_pcolormesh.test ...
Hangs here

excluding this test and the tests pass (apart from known failures):
nosetests -e "test_pcolormesh" -v matplotlib

please let me know what other information I can provide.
Thank you.