Impe,
The Facebook Share button has been deprecated by Facebook, and depending on how the ITPFloating Share is including it, it's likely the cause. When it's used on a page with Facebook's 'newer' Javascript library and features, which JFBConnect requires, it can cause them to break. For more information on it's deprecation, see:
www.sourcecoast.com/jfbconnect/docs/comm...tions#share-conflict
As to how to fix, if you want to post the URL, we can look at the page and see if there's other problems that may be the cause, but likely the Share button in the module is causing the problem. It's also possible/likely the module is re-including the Facebook Javascript library, which we include as well, and having it load twice on the page is causing the problem you're seeing.
Hope this helps give an idea of the issue,
Alex