mastertable detail not showing

Hi,

Has anyone had the mastertable info not appear in the header of the child related record. I have a Client table (pk = ClientID) with related tables Orders, Agent and Cards (all have a fk =fkClient). The database works well, but (despite selecting "Display master table info on detail page") the master info only appears on my agent and cards screens. The field headings for the Client table appear on my Orders page, but no Client data is displayed below.
(using ASPRunnerPro 5.0)
Thanks

Craig