You may have used special popup effects for your menu. Since special effects for IE no longer work on Internet Explorer, old menus with special effects cannot display properly on IE 10.

As a temporary solution, we suggest you remove the effect settings for popup menus or use effects that are cross-browser compatible.

For more details, please refer to the forum post linked below.
http://www.sothink.com/phpBB3/viewtopic.php?f=13&t=326915