title: Unable to add content to new Plone site: ValueError: Unable to find update_version_before_edit  exception
body: <p>Just finished a successful install of Plone 4.2.1 on CentOs using the unified installer.  Once logged in I cannot add any content.</p>
  
  <p>I get the following error:</p>
  
  <pre><code>Traceback (innermost last):
  
      Module ZPublisher.Publish, line 126, in publish
      Module ZPublisher.mapply, line 77, in mapply
      Module ZPublisher.Publish, line 46, in call_object
      Module Products.CMFPlone.FactoryTool, line 453, in __call__
      Module ZPublisher.mapply, line 77, in mapply
      Module ZPublisher.Publish, line 46, in call_object
      Module Products.CMFFormController.FSControllerPageTemplate, line 91, in __call__
      Module Products.CMFFormController.BaseControllerPageTemplate, line 28, in _call
      Module Products.CMFFormController.ControllerBase, line 231, in getNext
      Module Products.CMFFormController.Actions.TraverseTo, line 35, in __call__
  ValueError: Unable to find update_version_before_edit 
  </code></pre>
  
  <p>I've already run bin/buildout -n to update components.  Thanks in advance for any help.</p>