Rails - Jul 2006 - ActionController::UnknownAction hangs application

I''m trying to override rescue_action_in_public() using the PP example, 
but my application hangs every time I generate an error.

  def rescue_action_in_public(exception)
     case exception.class
       when ActiveRecord::RecordNotFound, 
ActionController::UnknownAction
         render( :file => "#{RAILS_ROOT}/public/404.html",
                 :status => "404 Not Found")
       else
         render( :file => "#{RAILS_ROOT}/public/500.html",
                 :status => "500 Error")
         email = SystemNotifier.deliver_exception_notification(
           self, request, exception)
     end
  end

If I change line 3 to

       when ActiveRecord::RecordNotFound

everything works just fine.  This suggests that the application is 
choking while comparing exception.class (which can be anything, I''ve 
tried both core and user errors) to ActionController::UnknownAction.

Note: I originally had line 2 as ''case exception'' but it
didn''t work
either.  I figured this was more readable, and I was trying to simplify.

Any suggestions are appreciated in advance!

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