title: Mac OSX - AttributeError: 'FigureCanvasMac' object has no attribute 'restore_region'
body: <p>Walking through matplotlib's animation example on my Mac OSX machine - <a href="http://matplotlib.org/examples/animation/simple_anim.html">http://matplotlib.org/examples/animation/simple_anim.html</a> - I am getting this error:-</p>
  
  <pre><code>File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/animation.py", line 248, in _blit_clear
      a.figure.canvas.restore_region(bg_cache[a])
  AttributeError: 'FigureCanvasMac' object has no attribute 'restore_region'
  </code></pre>
  
  <p>Does anyone who has encountered this before know how to resolve this issue?</p>
  
  <p>Looks like it's a known (and unresolved at this time of writing) issue - <a href="https://github.com/matplotlib/matplotlib/issues/531">https://github.com/matplotlib/matplotlib/issues/531</a></p>