MNE-Python source estimate visualization problems in Anaconda

Just a heads up for users who are using Anaconda with MNE-Python: The
update to Anaconda 2.1 can cause problems when visualizing source
estimates when the "wx" GUI toolkit is used. If you experience these
problems, make sure to start IPython as follows:

ETS_TOOLKIT=qt4 QT_API=pyside ipython --pylab=qt4

This switches the GUI toolkit to Qt4 and it is working correctly with
Anaconda 2.1 on CentOS 6.

Best,

Martin