I'm having some trouble when editing the main menu (second menu) in the WP-Admin at nav-menus.php...
There I was add Pages, Categoies and Posts, but I saw that Lost some itens when I start to use more than 18 itens. I can add whatever I want but when I save it, it lost all itens after the 17th or 18th element and save till there. The problem is I have to use 60 itens in the menu divided in 2 leves of dropdown......Is very annoying add all elements and then lost them when you try to save it.
Someone had this problem?