title: SignInManager.PasswordSignInAsync is lying to me
body: <p>I've been using this code to log in:</p>
  
  <pre><code>//
  // GET: /Account/Login
  [AllowAnonymous]
  public ActionResult Login(string returnUrl)
  {
      ViewBag.ReturnUrl = returnUrl;
      return View();
  }
  
  //
  // POST: /Account/Login
  [HttpPost]
  [AllowAnonymous]
  [ValidateAntiForgeryToken]
  public async Task&lt;ActionResult&gt; Login(LoginViewModel model, string returnUrl)
  {
      if (!ModelState.IsValid)
      {
          return View(model);
      }
  
      // This doesn't count login failures towards account lockout
      // To enable password failures to trigger account lockout, change to shouldLockout: true
      var result = await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, shouldLockout: false);
      switch (result)
      {
          case SignInStatus.Success:
              return RedirectToLocal(returnUrl);
          case SignInStatus.LockedOut:
              return View("Lockout");
          case SignInStatus.RequiresVerification:
              return RedirectToAction("SendCode", new { ReturnUrl = returnUrl, RememberMe = model.RememberMe });
          case SignInStatus.Failure:
          default:
              ModelState.AddModelError("", Account.LoginFailure);
              return View(model);
      }
  }
  </code></pre>
  
  <p>This is code that came with the Visual Studio MVC application template. It worked up until to day when all of the sudden it stopped working. I have debugged through this code <code>SignInManager.PasswordSignInAsync</code> returns <code>Success</code> but on the following request, I am not logged in.</p>
  
  <p><strong>Updates:</strong></p>
  
  <p>I shelved all of my pending changes and I still cannot log in. I am the only one working on this code. It is not anything I am doing. </p>
  
  <p><strong>Further Updates:</strong></p>
  
  <p>This code works on my coworkers machine. It works when I post it to the staging server. It just will not work on my computer. </p>