APEX

I created an interactive report, which works fine in the APEX developer, using the Application Express Authentication scheme.

To add it to our Self-Service web system, I change the authentication scheme to a custom scheme that has been working fine for other applications, although I don't know of any other interactive reports using this scheme in Self-Service.

Anyway, the interactive report is displayed in our Self-Service system using the custom authentication scheme, but if I display the Action menu and click on one of the options (Filter, Sort, Compute...), a pop-up window is displayed saying:
This procedure name is not found in the database:

wwv_flow.show

That error is also displayed when I try to edit the displayed filters.

Does anyone know why I might be getting that error or have suggestions on things to try to track it down?

Thanks,
Laura