title: Add apk menu doesn't show up in Arc Welder
body: <p>I installed Arc Welder on my Chrome 41, every time I launch the app I don't see any "add apk" menu. What's wrong with it? 
  I have an ubuntu machine. 
  <strong>UPDATE</strong>: here is a screenshot of the window <a href="http://imgur.com/qf0QRd0" rel="nofollow">screenshot</a></p>