I too have the same problem as the poster above and trust me when I tell you, the solution you posted is incorrect. Please post solutions that you know are true and or correct. Another way of changing the display is here at the link below but it doesnt apply to if you want a user's name to be displayed as their firstname and lastname. http://www.edugeek.net/forums/virtual-learning-platforms/25986-show-username-not-full-name-sharepoint.html