Hi Jon,

The javascript code in question is in an upload.html file. I have stripped it down to just:
<script type="text/javascript">

Ext4.onReady(function() {
            var s = new LABKEY.ext4.data.Store({
                schemaName: 'hplc',
                queryName: 'instrument'
            });
});
</script>

and I'm still getting 'TypeError: LABKEY.ext4 is undefined' in my browser's javascript console.

thanks!

-Will