Hi Elena;
The PBODBnnn.ini file must always be deployed with your application when connecting to any DBMS via the ODBC protocol. If you read the "deployment" section in the PB Help, it clearly states this requirement. By not deploying the .INI, the client driver will take various defaults - which in your case, may not work correctly.
FWIW: the PBODBnnn.ini deployment has been a PB standard since release 1.0. I have always been deploying this file (along with PBLABnnn.ini) with my PB applications.
HTH
Regards ... Chris