Datetime Overflow error when connecting to N4.0

I have a win 2003 server with sql 2000 and Navision 4.0 sql. On the client i have a Navision client and a .NET Aplication that allso connect to the same sgl server. When the .NET Aplicatin has connectet to the Master DB at the sql server, i get an error 535 Difference of two datetime columns caused overflow at runtime when i try to open my Navision Client, or if it is open then the same error occurs when i tryes to open the Session table in Databases information. I have the same setup running on two other servers without this problem but i have so far not found any difference that could solve this problem. /Lars