Current situation. I have two mac minis running OS 10.4.11 and NUD/Contact 5.3.1 with a Public event server on what I will call Mac2. Mac1 until a month ago ran NUD/Contact and when an appointment was opened, the bar with contact information would allow full contact window to be opened. The summary contact window says that Contact file is unknown. Preferences for the NUD shows the correct contact file. I went to a contact and repaired link in bar and calendar still would not show link. I have created new calendar and contact file and linked prior to connecting to server. Any thoughts or suggestions would be appreciated.