this is the basic aspx page I'm using just to try and get it to work (note: In the codebehind file I have also tried the line label1.text = sb.ToString instead of response.write(sb.ToString) both have the same effect):
<%@ Register TagPrefix="ce" Namespace="CuteEditor" Assembly="CuteEditor" %>
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm1.aspx.vb" Inherits="cute.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>cute editor test</TITLE>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="Visual Basic .NET 7.1" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<asp:label id="Label1" style="Z-INDEX: 102; LEFT: 40px; POSITION: absolute; TOP: 128px" runat="server" Width="480px" Height="120px">
</BODY>
</HTML>