'Ja' Is Not An Option, the existing options are.....

Hi everybody

I get the error message, below, upon start of the NAV client. I know why this error can surface, but I have no idea what so ever on where the problem is in this case.

//>> EDIT:
Client: NAV 5.0
Database: NAV 5.01
//<<

The Scenario:

User opens client as usual. Uses NAV as normal. Before closing the client, the user changes the language (ex. from danish to english).
When the user starts NAV again he receives the error below.

Note: All users known of, have this problem.


The Setup:

Remote server login, different user profiles for each user on the Windows Server, so each user has his/hers own ZUP in doc & settings.


The Error:

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Microsoft Dynamics NAV

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'Ja' is not an option.

The existing options are:

No, Yes



Appreciate your help