I teach Solidworks 2013 at a community college.  I teach two classes in different rooms.  In one room the drop down boxes work as you would expect.  In the other, the drop down boxes appear but if you move the mouse to select one of the items; the menu is gone before you can select any of the items.  Is there a setting in SolidWorks that controls this? Is there anyway to make the dropdown boxes work properly?

The room with the problem has two monitors. If that makes a difference?