I am seeing a Seqfault with the WX backend using WX Classing (3.03 from homebrew on OSX 10.10)
Following the merge of #3421

Sorry I should have tested this earlier but did not get round to it.

Doing

import matplotlib
matplotlib.use('WXAgg')
import matplotlib.pyplot as plt
plt.plot(range(100))
plt.show()

Results in a seqfault when run with python 2.7.9 and WX 3.03 classic

https://gist.github.com/jenshnielsen/0106d0b963ba50268824