Doesn't load if the value of initParams is set

Hello,

I am having problems implementing my chat application to my website. The application loads fine as long as I don't set a value of init params when I do it does not load and I don't recieve any exceptions/errors of any kind. The code is as follows:

Default.aspx

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Kawanoikioi.Community.Chat.Default" %><asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server"><style type="text/css">
        #silverlight-host
        {
            width:800px;
            height:500px;
        }</style></asp:Content><asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"><object id="silverlight-host" data="data:application/x-silverlight-2," type="application/x-silverlight-2"><param name="source" value="../../ClientBin/Kawanoikioi.Chat.xap" /><param name="minRuntimeVersion" value="5.1.30214.0" /><param name="initParams" id="InitParams" runat="server" onprerender="InitParams_PreRender" /></object></asp:Content>

Default.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Kawanoikioi.Community.Chat
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        }

        protected void InitParams_PreRender(object sender, EventArgs e)
        {
            InitParams.Attributes.Add("value", string.Format("username={0}", HttpContext.Current.User.Identity.Name));
        }
    }
}

App.xaml.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Markup;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace Kawanoikioi.Chat
{
    public partial class App : Application
    {
        public static string Username { get; private set; }

        public App()
        {
            this.Startup += this.Application_Startup;
            this.Exit += this.Application_Exit;
            this.UnhandledException += this.Application_UnhandledException;
            InitializeComponent();
        }

        private void Application_Startup(object sender, StartupEventArgs e)
        {
            if(!Application.Current.IsRunningOutOfBrowser)
            {
                Username = e.InitParams["username"];
            }

            this.RootVisual = new MainPage();
        }

        private void Application_Exit(object sender, EventArgs e)
        {

        }

        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            // If the app is running outside of the debugger then report the exception using
            // the browser's exception mechanism. On IE this will display it a yellow alert 
            // icon in the status bar and Firefox will display a script error.
            if (!System.Diagnostics.Debugger.IsAttached)
            {

                // NOTE: This will allow the application to continue running after an exception has been thrown
                // but not handled. 
                // For production applications this error handling should be replaced with something that will 
                // report the error to the website and stop the application.
                e.Handled = true;
                Deployment.Current.Dispatcher.BeginInvoke(delegate { ReportErrorToDOM(e); });
            }
        }

        private void ReportErrorToDOM(ApplicationUnhandledExceptionEventArgs e)
        {
            try
            {
                string errorMsg = e.ExceptionObject.Message + e.ExceptionObject.StackTrace;
                errorMsg = errorMsg.Replace('"', '\'').Replace("\r\n", @"\n");

                System.Windows.Browser.HtmlPage.Window.Eval("throw new Error(\"Unhandled Error in Silverlight Application " + errorMsg + "\");");
            }
            catch (Exception)
            {
            }
        }
    }
}

Thank you in advance. Please do not link me to http://msdn.microsoft.com/en-us/library/cc189004(v=vs.95).aspx or http://msdn.microsoft.com/en-us/library/cc838255(v=vs.95).aspx since I have already read these and from what I can tell I am doing it correctly based on these resources.