Menus and Submenus in Publisher's Gazette - Openpublish 3 OP3

Hi,

I have created an openpublish site on OP3 using the Publisher's Gazette theme included. I am having trouble creating sub-menus that actually drop down when hovered over or even clicked.

I created this in my main menu in Structure->Menus->Main Menu and I checked the box "show as expanded"

Is there anything I am missing here?

Here are my menu items:

-Sector [Here I've checked "show as expanded"]
--Basic Materials
--Consumer Goods
--Financial
--Technology

Any help would be greatly appreciated!

Thanks,
Eric