.Net 4.5 RC breaks UnobtrusiveValidationMode by Eagle_f91

After upgrading to .Net 4.5 RC on my Dev machine I get the following error on my LoginPage using Forms Authentication

Server Error in '/' Application.
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WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'. Please add a ScriptResourceMapping named jquery(case-sensitive).
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'. Please add a ScriptResourceMapping named jquery(case-sensitive).

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[InvalidOperationException: WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'. Please add a ScriptResourceMapping named jquery(case-sensitive).]
System.Web.UI.ClientScriptManager.EnsureJqueryRegistered() +222
System.Web.UI.WebControls.BaseValidator.OnPreRender(EventArgs e) +233
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +256
System.Web.UI.Control.PreRenderRecursiveInternal() +256
System.Web.UI.Control.PreRenderRecursiveInternal() +256
System.Web.UI.Control.PreRenderRecursiveInternal() +256
System.Web.UI.Control.PreRenderRecursiveInternal() +256
System.Web.UI.Control.PreRenderRecursiveInternal() +256
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4048


I have tried setting the ValidationSettings:UnobtrusiveValidationMode to WebForms in both the web.config file and in the global.asax but still get the error.

web.config code:
<?xml version="1.0"?>
<configuration>

<appSettings>
     <add key="ValidationSettings:UnobtrusiveValidationMode" value="WebForms" />
</appSettings>

    <system.web>
     <authorization>
        <deny roles="Fan" />
        <deny users="?" />
     </authorization>
    </system.web>

    <location path="elmah.axd">
        <system.webServer>
            <handlers>
                <add name="ELMAH"
                     verb="POST,GET,HEAD"
                     path="elmah.axd"
                     type="Elmah.ErrorLogPageFactory, Elmah"
                     preCondition="integratedMode" />
            </handlers>
        </system.webServer>
    </location>
    
</configuration>

global.asax
<%@ Application Language="C#" %>
<%@ Import Namespace="System.Web.Routing" %>

<script runat="server">

    void Application_Start(object sender, EventArgs e)
    {
        System.Web.UI.ValidationSettings.UnobtrusiveValidationMode = UnobtrusiveValidationMode.WebForms;
        RegisterRoutes(RouteTable.Routes);
    }

    private static void RegisterRoutes(RouteCollection Routes)
    {
    }
    
</script>