Hi Ken,

The demo page does indeed work in IE9.  I do see a difference between my code and yours that I can't explain;  perhaps you can shed some light.

Here is what IE's Developer Tools is showing as the onload attribute for the <img> tag that gets rendered in your demo page version of AjaxUploader:

onload="this.style.display="none" ; if(!window.CuteWebUI_AjaxUploader_Initialize){var xh=window.XMLHttpRequest?new XMLHttpRequest():new ActiveXObject('Microsoft.XMLHttp');xh.open('GET','/CuteWebUI_Uploader_Resource.axd?type=script&_ver=634982217233730498',false);xh.send('');eval(xh.responseText)}CuteWebUI_AjaxUploader_Initialize(this.id);"

And here is what Developer Tools is showing as the onload attribute on my page:

onload="this.style.display=&quot;none&quot; ; if(!window.CuteWebUI_AjaxUploader_Initialize){var xh=window.XMLHttpRequest?new XMLHttpRequest():new ActiveXObject(&#39;Microsoft.XMLHttp&#39;);xh.open(&#39;GET&#39;,&#39;/CuteWebUI.AjaxUploader.ashx?type=script&amp;_ver=635007824293053823&#39;,false);xh.send(&#39;&#39;);eval(xh.responseText)}CuteWebUI_AjaxUploader_Initialize(this.id);"

Here is my code:

<asp:UpdatePanel runat="server" id="UpdatePanel1" >

       <ContentTemplate>

            <uc1:UploadableFile runat="server" ID="ufAvatar" UploadArea="Avatars" ClientOnFileUploaded="uiAvatar_FileUploaded" UploadButtonText="Upload..." />

            <div style="padding-left: 3px; padding-top: 4px">

                  <asp:Label runat="server" ID="lblUploadedFileName"></asp:Label>

            </div>

      </ContentTemplate>

</asp:UpdatePanel>

UploadableFile is a user control that contains the Uploader control:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="UploadableFile.ascx.cs" Inherits="InsideConnector.UploadableFile" %>

<%@ Register TagPrefix="CuteWebUI" Namespace="CuteWebUI" Assembly="CuteWebUI.AjaxUploader" %>

<CuteWebUI:Uploader id="Uploader1" runat="server" OnFileUploaded="Uploader1_FileUploaded" InsertButtonID="btnUpload" OnPreRender="Uploader1_PreRender" >

      <CancelButtonStyle />

      <InsertButtonStyle />

      <ProgressLabelStyle />

      <ValidateOption />

</CuteWebUI:Uploader>

<asp:Button runat="server" ID="btnUpload" />

<asp:Label runat="server" ID="lblErrorMessage"></asp:Label>

Perhaps the UpdatePanel is contributing to the issue?

Thanks,

Mitch