title: Chromedriver failing to launch or connect
body: <p>Up until today, I have been using chromedriver to drive my watir-webdriver tests, and I have had no problems. My server still works and runs tests on the same version of the chromedriver and chrome. </p>
  
  <p>I have tried updating to the latest chromedriver, which is the chromedriver 2 experimental build.  This fails due to what I can only assume are still bugs being worked out of it. 
  I have also tried rolling back to the previous version of chromedriver with no success. </p>
  
  <p>If anyone has any experience with this, I would really appreciate your expertise. I am sure it will turn out to be something simple I have overlooked.  </p>
  
  <p>gem versions:</p>
  
  <pre><code>watir-webdriver (0.6.2)
  selenium-webdriver (2.29.0)
  cucumber (1.2.1)
  </code></pre>
  
  <p>trace from the chromedriver below</p>
  
  <pre><code>Started ChromeDriver port=9517 version=26.0.1383.0
  log=C:\Projects\oms_acceptance_tests\src\chromedriver.log
  [6136:5300:0212/122320:ERROR:master_preferences.cc(110)] Failed to read master_preferences file at C:\Program Files (x86)\Google\Chrome\Application\master_preferences. Falling back to default preferences.
  
  [6136:5300:0212/122320:ERROR:gpu_info_collector_win.cc(82)] Can't retrieve a valid WinSAT assessment.
  test\automation\proxy_launcher.cc(107): error: Value of: app_launched
  Actual: 5
  Expected: AUTOMATION_SUCCESS
  Which is: 0
  Error while awaiting automation ping from browser process
  
  [0212/122321:ERROR:proxy_launcher.cc(556)] Failed to ConnectToRunningBrowser
  
  [0212/122321:ERROR:automation_proxy.cc(319)] Channel error in AutomationProxy.
  Unable to either launch or connect to Chrome. Please check that ChromeDriver is up-to-date. Using Chrome binary at: C:\Program Files (x86)\Google\Chrome\Application\chrome.exe (Selenium::WebDriver::Error::UnknownError)
  </code></pre>