I highly doubt it. Also, all scripts should ideally be in the footer anyway. vBulletin defers most of its Javascript to initialize after the footer is loaded. If you weren't having issues before, I highly doubt this is the cause.
I have noticed issues with loading Google Analytics in the past, but it seemed just to be a connectivity or traffic related issue (the issue eventually went away).
If you're using the traditional (document.write) approach, try deferring Google Analytics and making it asyncronous:
Code:
<script type="text/javascript">
<!--
var _gaq = _gaq || [];
_gaq.push(
['_setDomainName', 'www.domain.com'],
['_setAccount', 'UA-XXXXXX-X'],
['_trackPageview']
);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
//-->
</script>
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