[jlosey]

Edit the headerinclude template for each style. make sure it looks like this:

<script type="text/javascript">
<!--
	var SESSIONURL = "{vb:raw session.sessionurl_js}";
	var SECURITYTOKEN = "{vb:raw bbuserinfo.securitytoken}";
	var IMGDIR_MISC = "{vb:stylevar imgdir_misc}";
	var IMGDIR_BUTTON = "{vb:stylevar imgdir_button}";
	var vb_disable_ajax = parseInt("{vb:raw vboptions.disable_ajax}", 10);
	var SIMPLEVERSION = "{vb:raw vboptions.simpleversion}";
	var BBURL = "{vb:raw vboptions.bburl}";
	var LOGGEDIN = {vb:raw bbuserinfo.userid} > 0 ? true : false;
         var RELPATH = "{vb:raw relpath}";
// -->
</script>

I had the same issue, and found that adding the last line in there fixed it. I had many problems converting to 4.0, and only just fixed this issue with my board.