title: Python webdriver in IE returns None for all find_elements
body: <p>I am developing tests using the latest version of Selenium 2 in python, installed with <code>pip install -U selenium</code>. I have a series of tests that run correctly using <code>webdriver.Firefox()</code>, but do not with <code>webdriver.Ie()</code>. It opens and navigates to the page correctly, but any attempt to access elements in that page fails. It does not appear to be a problem in other pages, but I cannot identify what would be causing the problem with mine.</p>
  
  <p>I can generate the problem easily by building an instance of the webdriver with:</p>
  
  <pre><code>from selenium import webdriver
  browser = webdriver.Ie()
  browser.get("page url")
  browser.find_elements_by_tag_name("html") #returns None!
  </code></pre>
  
  <p>I'm looking for any clues as to why this might be.</p>