Para los que instalen un foro vB 3.7.x y un skin OGENzen de vBSkinWorks (cualquier update, usé el de la 3.7.x y daba problemas) van a tener que, en vez de revertir la plantilla 'headinclude' como dicen por ahí, dejarla como lo siguiente:

headinclude:

Código:
<meta http-equiv="Content-Type" content="text/html; charset=$stylevar[charset]" />
<meta name="generator" content="vBulletin $vboptions[templateversion]" />
<if condition="$show['threadinfo']">
<meta name="keywords" content="$threadinfo[title], $vboptions[keywords]" />
<meta name="description" content="<if condition="$pagenumber>1"><phrase 1="$pagenumber">$vbphrase[page_x]</phrase>-</if>$threadinfo[title] $foruminfo[title_clean]" />
<else />
	<if condition="$show['foruminfo']">
<meta name="keywords" content="$foruminfo[title_clean], $vboptions[keywords]" />
<meta name="description" content="<if condition="$pagenumber>1"><phrase 1="$pagenumber">$vbphrase[page_x]</phrase>-</if>$foruminfo[description_clean]" />
	<else />
<meta name="keywords" content="$vboptions[keywords]" />
<meta name="description" content="$vboptions[description]" />
	</if>
</if>

<!-- CSS Stylesheet -->
$style[css]
<if condition="is_browser('opera') AND !is_browser('opera', '8.0.1')">
<style type="text/css">
ul, ol { padding-left:20px; }
</style>
</if>
<if condition="$show['editor_css']">
$editor_css
</if>
<!-- / CSS Stylesheet -->
<script type="text/javascript" src="$stylevar[yuipath]/yahoo-dom-event/yahoo-dom-event.js?v=$vboptions[simpleversion]"></script>
<script type="text/javascript" src="$stylevar[yuipath]/connection/connection-min.js?v=$vboptions[simpleversion]"></script>

<script type="text/javascript">
<!--
var SESSIONURL = "$session[sessionurl_js]";
var SECURITYTOKEN = "$bbuserinfo[securitytoken]";
var IMGDIR_MISC = "$stylevar[imgdir_misc]";
var vb_disable_ajax = parseInt("$vboptions[disable_ajax]", 10);
// -->
</script>
<script type="text/javascript" src="clientscript/vbulletin_global.js?v=$vboptions[simpleversion]"></script>
<if condition="$show['popups']"><script type="text/javascript" src="clientscript/vbulletin_menu.js?v=$vboptions[simpleversion]"></script></if>

<script type="text/javascript" src="clientscript/vbulletin_global.js"></script>
<if condition="$show['popups']"><script type="text/javascript" src="clientscript/vbulletin_menu.js"></script></if>
<if condition="$vboptions['externalrss']"><link rel="alternate" type="application/rss+xml" title="$vboptions[bbtitle] RSS Feed" href="external.php?type=RSS" /></if>

<!-- BACKGROUND REPEAT -->
<style type="text/css">
<!--
body {
	background-attachment: scroll;
	background-image: url(ogenzen/BG1.gif);
	background-repeat: repeat-x;
	background-position: left top;
}
-->
</style>
<!-- END BACKGROUND REPEAT -->


<script type="text/JavaScript">
<!--
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->
</script>



<script type="text/javascript">
document.cookie = "psistats_screenwidth = " + self.screen.width;
document.cookie = "psistats_screenheight = " + self.screen.height;
document.cookie = "psistats_screendepth = " + self.screen.colorDepth;
</script>
Imagino que para el resto de styles de vBSkinWorks sucederá lo mismo si se trabajan con estas versiones, espero que les sirva.