MVC 4 provided anti-forgery token was meant for user "" but the current user is "user"

I've recently put Live a web application which was built using MVC 4 and Entity Framework 5. The MVC application uses Razor Views. I noticed using Elmah that when users are logging into the application, sometimes they are getting the following error ``` The provided anti-forgery token was meant for user "" but the current user is "user" ``` I've done a bit of research already on how to fix this issue, but nothing seems to work for me. Please see my Login View and corresponding Controller Actions below. Razor View ``` @if (!HttpContext.Current.User.Identity.IsAuthenticated) { using (Html.BeginForm()) { @Html.AntiForgeryToken() @Html.ValidationSummary(true) <div class="formEl_a"> <fieldset> <legend>Login Information</legend> <div class="lbl_a"> Email </div> <div class="editor-field"> @Html.TextBoxFor(m => m.Email, new { @class = "inpt_a" })<br /> @Html.ValidationMessageFor(m => m.Email) </div> <div class="lbl_a"> @Html.LabelFor(m => m.Password) </div> <div class="editor-field sepH_b"> @Html.PasswordFor(m => m.Password, new { @class = "inpt_a" })<br /> @Html.ValidationMessageFor(m => m.Password) </div> </fieldset> </div> <br /> <p> <input type="submit" value="Log In" class="btn btn_d sepV_a" /> </p> } } ``` Controller ``` [AllowAnonymous] public ActionResult Login() { return View(); } [HttpPost] [AllowAnonymous] [ValidateAntiForgeryToken] public ActionResult Login(LoginModel model, string returnUrl) { if (ModelState.IsValid && _accountService.Logon(model.Email, model.Password, true)) { //Validate } else { // inform of failed login } } ``` I thought this all looked OK, but still the error persists. Does any have any ideas on how to fix this problem? Your help is greatly appreciated. Thanks.