In WordPress 3.3, the way Featured Images were handled changed, making the “Use as featured image” option in the Media Manager “disappear”. UberMenu 1.1.4 was released to make UberMenu compatible with the new WordPress release (please see the UberMenu change log at the bottom of the product page for more information).
If you are still using UberMenu 1.1.3 or earlier, and have upgraded to WordPress 3.3, you have two options: upgrade to UberMenu 2.0 (see the important upgrade instructions), which you can download through your CodeCanyon Downloads page.