If I set the menu bar cart to show only when there is something in the cart (my preference), my sub menu pages don't show up. When there is something in the cart, the sub menu items show up.
Also, if I set the menu bar cart to be always displayed, the sub menu pages do display.
By sub menu I mean child pages of a page in the menu that usually show up when hovering over the page in the menu.
Hope that makes sense.