browser issue after upgrade 7.05 to 7.06

Hi Guys, don't know if this is relevant to the upgrade but now the latest Ads block on homepage will not display properly in Internet explorer, I am using version 8. Obviously have cleared all cache etc. It does however display correctly in Firefox. Any guidance or suggestions with this issue would be very much appreciated. You can see it here www.whiteyonder.com the offending block is halfway down on right of homepage. Thanks in advance.