There were many things to learn at once about wiki, and the first was that 25 participants in a lab can not all be hitting "enter" at once. Before we knew it, comments were flying, "okay, Arizona is blocking me!" As a result, we also discovered that if you hit the back button after someone else has updated the site, and you don't have the updated edit, it will take it back to that earlier version. Very confusing. In essance, when there are many working on one file at once, be sure that they are very careful about refreshing their page prior to hitting that enter button again.