Well firstly I would question the use of opendns to block google-analytic.com, I use firefox and AdBlock Plus to filter some google content, you can also use NoScript which is how I used to block google-analytic.com on my old system.
I'm not sure however if this is an opendns problem or not, I use opendns but not the one installed on your system just their DNS servers
I have just tried to visit the getmiro.com link you gave, I had to temporarily allow getmiro in no script but I could see no requests from that home page for google-analytic.com cookies, scripts or blockable items for google-analytic.com in that page.
However there is a piece of JavaScript that calls for another javascript file, google-analytics.com/ga.js
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
So it would appear to be that access which is causing the problem, as far from blocking it at opendns, opendns seems to be asking for a security certificate.