Database diagram problems on a database migrated from SQL Server 2005

I ran into a wierd error message when trying to view the Diagrams on a database that was migrated to SQL Server 2005. Something about the user not being valid and to change the database owner.

A quick search brought up this quick fix:

Try running this command to change the compatibility level to SQL Server 2005.

EXEC sp_dbcmptlevel database_name, 90

Works like a charm! [SQL BOL]

Database diagram problems on a database migrated from SQL Server 2005