Hi rico1931!
Sorry that I have not answered your question!
Try START - RUN - type in "eventvwr" without " - press enter
There you will see your events for the computer. Do this on the service tier. Under Application you will find some "Microsoft Dynamics NAV" events. With some luck you can see a bit of information which can help you.
Please tell us how you can solve your problem. Because I also found a new interesting thing in NAV.
I made a card page where I forgot to fill in the "SourceExpr" for one field. So I had a line with type "Field" without any data information. Everything worked fine. But if the user tried to customize the page the clients crashes because NAV could not load the field list. Nice behaviour. Of course it was a programming error. But ... I don't need to tell anybody here about error handling in NAV ...
/mik