title: OS X 10.6.6 and "adb devices" fails to list android devices
body: <p><a href="http://www.androidcentral.com/what-adb" rel="noreferrer" title="Android 201: What is adb?"><code>adb devices</code></a> was working fine last year, but after upgrades and new software installs,
  <code>adb devices</code> no longer recognizes USB attached Android devices.</p>
  
  <p>Here is what I have tried:</p>
  
  <pre><code>adb kill-server
  adb devices
  
  adb usb
    error: Device not found
  </code></pre>