For some reason, unlike on the old nav menu's, you cannot have the mobile nav menu come up as a different color. The mobile background color makes the entire element that color now. So if I have my background color set as see through, the mobile nav pop up will be see through as well, when as before I could have it be see through and the popup could be white. I can't even use the new nav menu until this is fixed. Other than that the mega nav menus are really cool