title: 'Object reference not set' after changing doc type
body: <p>I made a change to a document type (renamed a property and its alias, and added another property) and now a user control that calls node.ChildrenAsTable("doctypealias") is giving 'Object reference not set to an instance of an object'. I've confirmed that node != null.</p>
  
  <p>I'm using Umbraco 4.7.0. on a dedicated web server (full trust) running IIS7. </p>
  
  <p>I've tried recycling app pool, restarting IIS, deleting umbraco.config, touching web.config, re-uploading the user control, republishing entire site. Nothing works.</p>
  
  <p>To clarify, the user control gets the current node, and tries then to call ChildrenAsTable() on the current node. The current node's children are pages of the doctype that I edited.</p>
  
  <p>Please help!!</p>