This issue is coming from some JavaScript Code you added in the Theme which is broken.
I confirmed this by doing the following test (the theme testing part only):
http://www.tipsandtricks-hq.com/forum/topic/test-to-identy-a-conflicting-theme-or-plugin
I see you are using the "Thesis" theme. I know that "Thesis" is a fantastic theme that works with all of our plugins, so the theme itself has nothing to do with it. It has to be some code you added when customizing it which is going bad.
Once you mess up the JavaScript on the page it affects other JavaScript too. Check all the JavaScript code that you added in the theme and identify the code that's breaking.
Where did you add this bit of code from? Try removing this code:
<script type="text/javascript">
stLight.options({
publisher:'wp.14742c16-0ec2-498d-ba24-0e2c8275827f';
var st_type='wordpress3.1.2';
onhover:'false';
tracking:'google'
});
</script>