default query in Recipients folder

All of a sudden one end user can't view any recipients, because when she clicks the Recipients folder an error message occurs:

ORA-00904: C0.TSCANCERAS invalid identifier
SQL statement ... could not be executed

The statement contains "order by C0.TSCANCERAS", but this table and field is not part of the statement.

Has anyone had this problem? What can you do about it? The rest of the users have no problem.