title: Difftool doesn't open, and command line hangs
body: <p>I have Meld configured as my difftool.  I'm pretty sure it's configured correctly, because if I do <code>git config -l</code>, I get</p>
  
  <pre><code>merge.tool=meld
  diff.tool=meld
  mergetool.meld.path=C:\Program Files (x86)\Meld\Meld.exe
  difftool.meld.path=C:\Program Files (x86)\Meld\Meld.exe
  </code></pre>
  
  <p>The setup is the same to my mergetool, and the mergetool does work correctly.</p>
  
  <p>I'm trying to compare my current files to my last commit.  When I do <code>git difftool</code>, the command line says</p>
  
  <pre><code>Viewing (1/9): 'myfile.cs'
  </code></pre>
  
  <p>But nothing else happens.  Meld doesn't open.  The command line also appears frozen, and I have to close Powershell.</p>
  
  <p>How do I get the Meld to open correctly?</p>