I had the same issue with 3.1. I’m probably not the right person to test since I’m not sure what I’m looking for. I’ve disabled the plugin for now. If you find out what is wrong, please contact me through the website. I would really love to use this, and the newest version seems like it would be a lot less heavy if the javascript can be fixed.
The error only appears in IE7 for me, but it really slows down the page a lot in Firefox too.