I want to add a contract for an item or for a resource I have for sale. I cannot for the life of me choose the item in the drop down menu. Usually, (not always), the menu will list the resources I have in the warehouse, but if I want to sell a book or upgrade, even if its in the warehouse, I cannot choose that pulldown choice or name the item. I have tried to use tab, to mouse over the choices, to hit enter instead of a mouse click, to put in the price and number first; nothing seems to work. Th