The problem mentioned before has been solved. Like most of us suspected, there was a synonym missing.
SQL> select OWNER, SYNONYM_NAME
2 from all_synonyms
3 where synonym_name like 'MGMT_VIEW_UTIL';
no rows selected
SQL> create public synonym MGMT_VIEW_UTIL FOR MGMT_VIEW_UTIL;
After creating the synonym, the reports look fine. I believe this porblem was caused by the export/import from the sysman schema.