There's a few possible causes:
* Something on that page is including the following file:
static.ak.fbcdn.net/connect.php/js/FB.Share
That file is for the very old (2+ years) Facebook Share button. That button has been discontinued by Facebook and that Javascript file conflicts with their newer Javascript library which we include.
* sh404SEF has it's social button feature enabled. You should disable the sh404 Social Plugin as it re-includes the Facebook Javascript library, which again can cause conflicts with our stuff.
Hope that helps, but if you get those cleared up and things still don't work, just let us know!
Alex