title: HttpContext.Current.User.IsInRole(roleName) always returns false
body: <p>I'm working on adding authorization to an ASP.NET MVC App and have run into a road block.  I was finally able to get our custom membership provider wired up and get authentication working for the App. Now, as expected, if I add the [Authorize] attribute to my controllers, the user must be authenticated to view the page. I have also successfully tested [Authorize(Users="{userName}")] which also works to restrict the page to that specific user. </p>
  
  <p>The problem is that [Authorize(Roles="{RoleName}")] does not seem to work as I'm expecting. If I add that attribute to a controller, anytime I try to access the corresponding page, I am redirected to our login page. This is what I would expect to have happen if the user does not have the required role, but it is happening even if the user has that role.  I have checked both User.IsInRole("{roleName}") and HttpContext.Current.User.IsInRole("{roleName}") in a View, a Controller and a Helper method and this always returns 'False'.  </p>
  
  <p>I have verified that the users I am working with have the roles I am trying to authorize against. I have also tested these users in a WebForms App that restricts page access by the same roles and it works fine. I figure that I have something setup wrong somewhere or am missing something simple, but after searching all morning, I haven't found anything that has gotten me any closer to the solution, so I'm hoping someone here can help me out.</p>