Problem
A typical usability problem with menus I frequently see is a menu or sub-menu (grouping of menu items beneath another menu) that instantly disappears if the user mouses over the wrong pixel while trying to mouse over to the menu item.  This can be frustrating causing the user to have to retrace their steps to once again reveal the menu and this time carefully tip-toe the mouse back through the narrow parameters allowed them so as not to trip the code just waiting to remove their destination.

Solution
This is a fairly simple problem technically which requires the library author to allow from some time delay before hiding the menu.