AddThis

AddThis buttons disappearing when reloading!

I have AddThis installed on a page with the following code:

<!-- Social Buttons BEGIN -->
<div class="addthis_toolbox addthis_default_style addthis_32x32_style">
<a class=addthis_button_facebook></a>
<a class=addthis_button_twitter></a>
<a class=addthis_button_linkedin></a>
<a class=addthis_button_favorites></a>
<a class=addthis_button_email></a>
<SCRIPT>
VAR addthis_config = {
services_compact: 'facebook,twitter,linkedin,favorites,email',
services_exclude: 'print'
}
</SCRIPT>
<SCRIPT type=text/javascript src="https://s7.addthis.com/js/250/addthis_widget.js#pubid=ra-4eefbc81287aed62">
</SCRIPT>
<!-- Social Buttons END -->

The problem is that the buttons fail to display if the page is reloaded, but only on about 1 in 15 reloads. When the buttons do not display, there is unusual text in its place.

Unfortunately, I can't provide a URL for you to see this because it's on a private "test" server. Here are screen shots:

Working: http://db.tt/4iLfuyva
Not working: http://db.tt/vNrAIeMA

Any advice appreciated.