[kh99]

Look in the setting under "Server Settings and Optimization Options", there are some path settings for YUI.

If those look OK, then chck your headinclude template for a section like this:

<script type="text/javascript">
<!--
	if (typeof YAHOO === 'undefined') // Load ALL YUI Local
	{
		document.write('<script type="text/javascript" src="clientscript/yui/yuiloader-dom-event/yuiloader-dom-event.js?v={vb:raw vboptions.simpleversion}"><\/script>');
		document.write('<script type="text/javascript" src="clientscript/yui/connection/connection-min.js?v={vb:raw vboptions.simpleversion}"><\/script>');
		var yuipath = 'clientscript/yui';
		var yuicombopath = '';
		var remoteyui = false;
	}
	else	// Load Rest of YUI remotely (where possible)
	{
		var yuipath = '{vb:stylevar yuipath}';
		var yuicombopath = '{vb:stylevar yuicombopath}';
		var remoteyui = true;
		if (!yuicombopath)
		{
			document.write('<script type="text/javascript" src="{vb:stylevar yuipath}/connection/connection-min.js?v={vb:raw vboptions.simpleversion}"><\/script>');
		}
	}

and make sure it hasn't been changed or removed.