Gtk-WARNING **: Locale not supported by C library. while using several Python modules (mayavi, spectral)

Question

I updated my MacBook to Mavericks, reinstalled Macports and all Python 2.7 modules I usually use. While running Python I get the following messages:

when importing m

Answer 1

While using OS X Mavericks one has to use: ipython --pylab=wx instead of ipython --pylab=osx to avoid crashing the X11 window. I don't know why this works.