No return Errors

Hi

My scenario :

PostgreSQL 7.1.3 under FreeBSD 4.5-STABLE . 70 concurrent users under ODBC via ADO.

This scenario has been working great since april 2002. Now, ADO can't view any error like 'permission denied' and
tries to open a recordset that never can't read. What's happening ?? I'm completly lost !. If I have mount another machine
with new postgresql 7.2.3 and works fine with the same client. In errlog I cant see that 'permission denied' is detected
for postgres but ADO seem like don't see it. Postgresql.conf is in standard state

Access see the error, and don't understand it.

Thanks for your time

Simeó Reig