This question has been answered by BobRay. See the first response.
Using the unauthorized page can be tricky (though it can be done). The problem is that for unauthorized users, the page often doesn't exist, so it's a "page not found" event and they get sent to the page specified in the "error_page" System Setting, which is usually the home page, instead of the unauthorized page.
See the Unauthorized Versus Error Page section here: http://bobsguides.com/revolution-permissions.html