CRM 2011 outlook client: Some entities are not available after changing the user language

Error: cannot load crm when trying to view crm records for contact/accounts in outlook 2010

EDIT: I found out that this problem occurred because of the selected language by the user. Now i still have to find out how to solve this problem so that the user can keep his language.

Original question:

A customer of our company recent did the migration from CRM 4.0 to CRM 2011. First everything worked perfect but after a few days, one of the crm users could not see the reco开发者_高级运维rds for accounts and contacts in his outlook client. A few days later, another user noticed the same error.

When they try to view the records for certain entities. No records are shown in de window. Only a message: "CRM cannot be loaded" (translated from dutch, i don't know the exact message in english). Other entity records are shown perfect.

They tried already reinstalling the outlook client en reconfigureing there organisation in outlook.

When i open their organistation in my outlook, everything works just fine.

They are using outlook 2010 and me too.

Any help would be very appreciated.

Thanks!

EDIT: When i login in outlook crm with his user, i have the same problem. So it's user specific problem. Both users have the system administrator role.

Maybe there is some issues with the language used by the specific user? I earlier had a similar problem with an installation where English was used as base language - and the Norwegian language pack added later. Try to switch to English for the user who experiences these problems. If it helps you have a little translating to do.