I have set the hoverOverDelay option to 700 for my drop down. When I select a menu item, more often than not, that item then disappears from the menu if I click on the drop down again. If I then remove the hoverOverDelay option from my jquery, the problem goes away and the menu works fine.
Steps to reproduce:
Click on the drop down, select the last item Click on the drop down again, notice that the item you selected in step 1 is now missing.