Why Isn't The Submenu Visible?

The dropdown submenu not being visible is a fairly common problem. The reason why this happens is because below the menu there's a page element with a high z-index value, so the submenu is displayed under that element. Most of the times the element that causes this is an image slider. We're trying to prevent that from happening with our menus, but just in case you're having this problem, the solution is to use the z-index property with a very high value for the submenus:

#cssmenu ul ul {
    z-index: 999;