no option to choose menu in Dropdown Menu Widget

I just installed Dropdown Menu Widget & watched the video on how to set it up. When I put the widget in the widget area, I don’t have the option to select which menu to use. I made several menus as a test.

I’m using the Atahualpa theme, and have put it in a custom widget I made for the header area.

http://wordpress.org/extend/plugins/dropdown-menu-widget/