title: Seaborn plots not showing up
body: <p>I'm sure I'm forgetting something very simple, but I cannot get certain plots to work with Seaborn. </p>
  
  <p>If I do:</p>
  
  <pre><code>import seaborn as sns
  </code></pre>
  
  <p>Then any plots that I create as usual with matplotlib get the Seaborn styling (with the grey grid in the background).</p>
  
  <p>However, if I try to do one of the examples, such as:</p>
  
  <pre><code>In [1]: import seaborn as sns
  
  In [2]: sns.set()
  
  In [3]: df = sns.load_dataset('iris')
  
  In [4]: sns.pairplot(df, hue='species', size=2.5)
  Out[4]: &lt;seaborn.axisgrid.PairGrid at 0x3e59150&gt;
  </code></pre>
  
  <p>The pairplot function returns a PairGrid object, but the plot doesn't show up. </p>
  
  <p>I'm a little confused because matplotlib seems to be functioning properly, and the Seaborn styles are applied to other matplotlib plots, but the Seaborn functions don't seem to do anything. Does anybody have any idea what might be the problem?</p>