title: Discussion Board Subject View displaying "Attempted to use an object that has ceased to exist."
body: <p>We did a database upgrade from SharePoint 2007 to SharePoint 2010.  We are still using the 2007 interface.  After the upgrade there's a problem with one of our discussion boards:
    The discussion board is included as a web part on the landing page of one of our sites.  It works there, no problem.  However, if you click on the title of the web part to bring you to the default view for the discussion board (Subject View.aspx), you get an error screen with "Attempted to use an object that has ceased to exist."</p>