dropdown menu doesn't always show up in corporateclean
I see, where the problem is. In the parent menu you also have to select "show as expanded" option to display the child menu in drop down or whatever configuration you have.



Steps (if you may need):


Goto Structure->Menus
Select the Menu and click list links
Find the parent menu and edit it
Inside that you will have option to choose "show as expanded", Check that
Clear the cache and you are good to go.