HTML Custom Block Won't Show Up

[jhutch]

Anyone have any idea why a block with the following code won't show up on any page?

 

<div id="zergnet-widget-33375"></div>

<script language="javascript" type="text/javascript">
	(function() {
		var zergnet = document.createElement('script');
		zergnet.type = 'text/javascript'; zergnet.async = true;
		zergnet.src = 'http://www.zergnet.com/zerg.js?id=33375';
		var znscr = document.getElementsByTagName('script')[0];
		znscr.parentNode.insertBefore(zergnet, znscr);
	})();
</script>

 

It worked on the previous version of IPB, but not since the upgrade to IPB4