I have the same problem here. I've been trying to get my menu open on both a click and mouse over. I thought I finally had the solution, but then I noticed the same problem as James, when I mouse over a (parent) menu item, the (child) item menu opens. However, when I now leave the parent item and move the mouse over to a child item, the menu closes again and I can't open any item...
See also my attached code below.
Is there any solution to this???
Any help would be appreciated!