ODBC Access from Visual Foxpro

Hi All and sorry if this is a FAQ...

I am trying to access a PostgreSQL V 7.1.2 server with PsqlODBC from
Microsoft Visual Foxpro 5.0.  The machine is MS Windows NT 4.0 SP 6.

I can access the tables with no problem but only in read-only mode,
although
I unchecked the "read-only" checkbox in the ODB driver & datasource tabs.

Any idea what I am doing wrong?

Regards & Thanks,
Marc