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.

I'm using Umbraco 4.7.0. on a dedicated web server (full trust) running IIS7. 

I've tried recycling app pool, restarting IIS, deleting umbraco.config, touching web.config, re-uploading the user control, republishing entire site. Nothing works.

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.

Please help!!

Below is stack trace:

[NullReferenceException: Object reference not set to an instance of an object.]
   umbraco.presentation.nodeFactory.Node.populateRow(DataRow& dr, Node n, Hashtable AliasesToNames) +662
   umbraco.presentation.nodeFactory.Node.ChildrenAsTable(String nodeTypeAliasFilter) +579
   usercontrols_ListAccommodation.Page_Load(Object sender, EventArgs e) in c:\mysite\usercontrols\ListAccommodation.ascx.cs:16
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +24
   System.Web.UI.Control.LoadRecursive() +70
   System.Web.UI.Control.LoadRecursive() +189
   System.Web.UI.Control.LoadRecursive() +189
   System.Web.UI.Control.LoadRecursive() +189
   System.Web.UI.Control.LoadRecursive() +189
   System.Web.UI.Control.LoadRecursive() +189
   System.Web.UI.Control.LoadRecursive() +189
   System.Web.UI.Control.LoadRecursive() +189
   System.Web.UI.Control.LoadRecursive() +189
   System.Web.UI.Control.LoadRecursive() +189
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3063