The controller for path '/favicon.ico' could not be found or it does not implement the IController interface./r/nParameter name:

The Routing system no longer special-cases the period character.  Take a look at the Global.asax provided with the April codeplex templates:

1                routes.MapRoute(
2                    "Default" ,                                              // Route name
3                    "{controller}/{action}/{id}" ,                           // URL with parameters
4                    new { controller = "Home" , action = "Index" , id = "" }, // Parameter defaults
5                    new { controller = @"[^/.]*" }                          // Parameter constraints
6                );

Note that on line (5) above, we're constraining the controller parameter such that periods are invalid characters, so the routing system won't bother looking for the favicon.ico controller.

Try adding a similar constraint to your registered routes.  Hopefully this will solve your issue. :)