Mark,
Can you check the imageupload.aspx file?
Make sure the following code has not been changed:
<%@ Page language="c#" EnableViewState="true" ValidateRequest="False" AutoEventWireup="false" Inherits="DotNetGallery.Include.imageupload1" %>
asp.net Chat http://cutesoft.net/ASP.NET+Chat/default.aspx
Web Messenger: http://cutesoft.net/Web-Messenger/default.aspx
asp.net wysiwyg editor: http://cutesoft.net/ASP.NET+WYSIWYG+Editor/default.aspx
asp wysiwyg html editor: http://cutesoft.net/ASP
asp.net Image Gallery: http://cutesoft.net/ASP.NET+Image+Gallery/default.aspx
Live Support: http://cutesoft.net/live-support/default.aspx