MVC 5 AddToRole requires logout before it works?

I'm finding that if I add a user to a role in ASP Identity, it doesn't take effect until I log out and log back in. Is there something I need to do to refresh a user's roles without forcing a user to log off first?

Here's how I'm adding the user to the role.

var userManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext()));
var userId = HttpContext.Current.User.Identity.GetUserId();

userManager.AddToRole(userId, roleName);

Then, almost immediately, I redirect the user to this action method. I can tell in the database that I've been added to the correct role, but MVC still redirects me to the login page. However, if I log out, log back in, and attempt to go to this action method, it works just fine.

    [Authorize(Roles = RecoveryStandardRoles.ServiceProvider)]

    public partial class CertifyController : Controller

{
    #region Public Methods and Operators

    public virtual ActionResult CompanyProfile()
    {
        return this.View();
    }

    #endregion
}

Thank you for taking time to look at my question!