Act 2009, all latest updates. I operate two users sharing one database. One user has developed a lookup failure that applies to all fields. After one or two searches the following message appears: "One or more errors have been detected. Place your mouse on the red error indicator(s) to display the error message(s)." No red indicators appear on the screen. Clicking O.K. brings the following message, "This operation cannot currently be performed. Please fix the invalic contact information first." Restarting Act allows one or two searches before the message occurs again. Second user has no lookup difficulties. Database has 12,800 contacts. Help!