Matplotlib 1.5.1, Python 3.5.2, ipython 5.0.0, OS X El Capitan; Python3 installed with Homebrew, matplotlib through Pip. Empty matplotlibrc file, except for backend : macosx

When creating a figure in non-interactive mode in ipython, matplotlib behaves as expected:

import matplotlib.pylab as pl
pl.ioff()
pl.figure()
pl.show()

Gives me a nice on-screen figure. When I do the same in interactive mode (change ioff() to ion()) I get no on-screen figure, nothing. Exact the same happens when I use pl.ioff() combined with pl.show(block=False), i.e. I again get no on-screen figure.

Could this be a bug in matplotlib?