aspx Login not working in Internet Explorer

I have a side that I created in Visual Studio 2010. It has a login that protects a particular folder. I am using a CustomMembershipProvider (using SQL) for the login. In Chrome and FF, it works fine. In IE, it is stuck on the login page.

I also tried putting the code directly into the login form in the Authenticate code, and that doesn't work either.

Here is my web.config:

      <location path="Admin">
            <system.web>
      <customErrors mode="Off" />
                  <authorization>
                        <deny users="?"/>
                        <allow users="*"/>
                  </authorization>
            </system.web>
      </location>
      <system.web>
            <compilation debug="true">
                  <assemblies>
                        <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                        <add assembly="System.Web.Extensions.Design, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
                        <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                        <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                        <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
                        <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                        <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/></assemblies></compilation>
            <authentication mode="Forms">
                  <forms name="vasWebAuthCookie" timeout="5" loginUrl="Login.aspx" defaultUrl="Admin/default.aspx" path="Admin" protection="All"/>
            </authentication>
            <membership defaultProvider="AspNetCustomMembershipProvider">
                  <providers>
                        <clear/>
                        <add name="AspNetCustomMembershipProvider" type="CustomMembershipProviderLib.CustomMembershipProvider"/>
                  </providers>
            </membership>

..... (there's a lot more....)

In the code that's written directly into the login page, it gets to the response.redirect, and looks like it processes, and does nothing.

Please help! I am desperate!

protected void LoginUser_Authenticate(object sender, AuthenticateEventArgs e)
    {
        string sConn = System.Web.Configuration.WebConfigurationManager.ConnectionStrings["vaswebcomConnectionString1"].ToString();
        SqlConnection conn = new SqlConnection(sConn);
        conn.Open();

        TextBox tUser =(TextBox) this.LoginUser.FindControl("UserName");
        TextBox tPassword = (TextBox) this.LoginUser.FindControl("Password");

        SqlCommand cmd = new SqlCommand("SELECT * FROM tblAdmin WHERE sUserID = '" + tUser.Text.ToString() +
            "' AND sPassword = '" + tPassword.Text.ToString() + "'", conn);

        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.Read())
            e.Authenticated = true;
        else
            e.Authenticated = false;


        conn.Close();
        string sRedirect = Request.QueryString["ReturnURL"].ToString();
        Response.Redirect("Default.aspx", false);
    }

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