Thanks for the tip. In the version I have (8.3.20083.1009) I have the following at the top of the file. Does this look ok?

<?xml version="1.0"?>
<!–
Infragistics UltraWebGrid Script
Version 8.3.20083.1009
Copyright (c) 2001-2008 Infragistics, Inc. All Rights Reserved.
–>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt;
<xsl:output omit-xml-declaration="yes" method="html"/>

 I also just tried using the javascript in this post (http://forums.infragistics.com/forums/p/19915/72390.aspx#72390) but I get the same error. It seems like there is something wrong with the ig_WebGrid.xslt file. I've been trying to make this work for a while now and what I really don't get is why it seems to work fine for a while and then I'll reload the page and get this error.

 I believe that I can't get to the hotfixes you refer to as I am using an evaluation. I have been trying to make an evalution work because I am seriously considering purchasing the asp.net package. I continue to have strange javascript problems. I am now using the web.config file to direct the controls to get their javascript from a directory in my source. I copied the CLR 3.5 javascript directory over because there was an update to the ig_WebGrid.js in this thead;http://forums.infragistics.com/forums/p/18367/66804.aspx#66804.

It seems as if I use the local javascript directory I get different errors then if I use the default javascript files. One way or another it's not working.