[Plugin: Events Calendar] Calendar breaks in IE9

Hi,

This plugin always worked great for 2 years now. I’m using the calender widget to display it on my website (http://www.sintjozefhoeve.be/educatie/). However, with the release of Internet Explorer 9 the calender is broken. Buttons, tooltip, etc are not working.

I searched a lot in the code for a jquery conflict or so. Also tried the Jquery Extreme protection option, but without result.

Is there a solution for this? Thanks in advance.

http://wordpress.org/extend/plugins/events-calendar/