IE 9 Problems

Hey guys I don’t know if you can help me or not since I’m dealing with Genesis but I’m using the Agency Child Theme which normally has 3 columns on the homepage after the slider. The client wanted to have 4 columns so I changed some things to try and make that happen. It worked great in Safari, Firefox, and IE 8 but for some reason IE 9 will just not work according to the client. I personally don’t have IE 9 so I can’t test it to figure out what’s wrong. Do you have any ideas?

Here is the website

http://www.dmpremier.com