title: unknown error: failed to write prefs file
body: <p>I keep getting the error while running functional tests using runner with following:
  -selenium 2.44
  -Chrome Driver
  -Windows Server 2008 R2 Enterprise</p>
  
  <pre><code>Error Description: Listening on 0.0.0.0:7000
  Starting tunnel...
  UnknownError: [POST http://test.com/wd/hub/session / {"de
  siredCapabilities":{"browserName":"chrome","name":"tests/intern","idle-timeout":
  60,"selenium-version":"2.44.0"}}] unknown error: failed to write prefs file
  (Driver info: chromedriver=2.12.301325 (962dea43ddd90e7e4224a03fa3c36a421281ab
  b7),platform=Windows NT 6.1 SP1 x86_64) (WARNING: The server did not provide any
  stacktrace information)
  Command duration or timeout: 1.06 seconds
  </code></pre>
  
  <p>Anyone have ever come across such issue? How do i fix this? Suggestions please</p>