title: Spyder won't launch after conda install -c conda-forge opencv
body: <p>I have installed <code>opencv</code> by the following command:</p>
  
  <pre><code>conda install -c conda-forge opencv
  </code></pre>
  
  <p>My environment is python 3.5 and spyder 3.3. All other packages come with installation of anaconda and updating of conda. </p>
  
  <p>It is clear that the <code>opencv</code> installation gives the <code>spyder</code> launching error!</p>