Hi Ruth,
While I do not believe that this is your problem, it's always useful to know exactly what release of a specific version is being used. A complete version/release would be 9.0A (080122) where the numbers in the brackets represent a release date. What release of 9.0A are you using ? Select Help | About for the version info.
Regarding the DI error, is the department defined in Edit | Departments ?
Pete