Вот лог ODBC:
[0.023]conn=021E3C80, PGAPI_DriverConnect( in)='DSN=PostgreSQL30W;', fDriverCompletion=1
[0.026]DSN info: DSN='PostgreSQL30W',server='localhost',port='5432',dbase='GCS_DB',user='ostwolf',passwd='xxxxx'
[0.027] onlyread='0',protocol='7.4',showoid='0',fakeoidindex='0',showsystable='0'
[0.028] conn_settings='',conn_encoding='(null)'
[0.028] translation_dll='',translation_option=''
[0.030]Driver Version='08.03.0100,200801220001' linking 1400 static Multithread library
[0.031]Global Options: fetch=100, socket=4096, unknown_sizes=0, max_varchar_size=255, max_longvarchar_size=8190
[0.032] disable_optimizer=1, ksqo=1, unique_index=1, use_declarefetch=0
[0.032] text_as_longvarchar=1, unknowns_as_longvarchar=0, bools_as_char=1 NAMEDATALEN=64
[0.033] extra_systable_prefixes='dd_;', conn_settings='' conn_encoding=''
[0.388] [ PostgreSQL version string = '8.3.1' ]
[0.389] [ PostgreSQL version number = '8.3' ]
[0.397]conn=021E3C80, query='select oid, typbasetype from pg_type where typname = 'lo''
[0.533] [ fetched 0 rows ]
[0.536] [ Large Object oid = -999 ]
[0.536] [ Client encoding = 'UTF8' (code = 6) ]
[0.537]conn=021E3C80, PGAPI_DriverConnect(out)='DSN=PostgreSQL30W;DATABASE=GCS_DB;SERVER=localhost;PORT=5432;UID=ostwolf;PWD=xxxxxxxx;CA=d;A6=;A7=100;A8=4096;B0=255;B1=8190;BI=0;C2=dd_;;CX=1b50fbb;A1=7.4-1'
[0.670]conn=021E3C80, query='select relname, nspname, relkind from pg_catalog.pg_class c, pg_catalog.pg_namespace n where relkind in ('r', 'v') and nspname not in ('pg_catalog', 'information_schema', 'pg_toast', 'pg_temp_1') and n.oid = relnamespace order by nspname, relname'
[0.763] [ fetched 1 rows ]
[0.868]conn=021E3C80, query='select * from tbClient where 0 = 1'
[0.875]ERROR from backend during send_query: 'SERROR'
[0.875]ERROR from backend during send_query: 'C42P01'
[0.876]ERROR from backend during send_query: 'Mотношение "tbclient" не существует'
[0.877]ERROR from backend during send_query: 'F.\src\backend\catalog\namespace.c'
[0.877]ERROR from backend during send_query: 'L273'
[0.878]ERROR from backend during send_query: 'RRangeVarGetRelid'
[0.878]STATEMENT ERROR: func=SC_execute, desc='(null)', errnum=7, errmsg='Error while executing the query'
[0.879] ------------------------------------------------------------
[0.880] hdbc=021E3C80, stmt=021E8C20, result=021EA5C0
[0.880] prepare=0, internal=0
[0.880] bindings=021E9008, bindings_allocated=19
[0.881] parameters=00000000, parameters_allocated=0
[0.881] statement_type=0, statement='select * from tbClient where 0 = 1'
[0.881] stmt_with_params='select * from tbClient where 0 = 1'
[0.882] data_at_exec=-1, current_exec_param=-1, put_data=0
[0.882] currTuple=-1, current_col=-1, lobj_fd=-1
[0.882] maxRows=0, rowset_size=1, keyset_size=0, cursor_type=0, scroll_concurrency=1
[0.883] cursor_name='SQL_CUR021E8C20'
[0.883] ----------------QResult Info -------------------------------
[0.883] fields=021E9598, backend_tuples=00000000, tupleField=0, conn=00000000
[0.884] fetch_count=0, num_total_rows=0, num_fields=0, cursor='(NULL)'
[0.884] message='ERROR: отношение "tbclient" не существует', command='(NULL)', notice='(NULL)'
[0.885] status=7, inTuples=0
[0.885]CONN ERROR: func=SC_execute, desc='(null)', errnum=110, errmsg='ERROR: отношение "tbclient" не существует'
[0.886] ------------------------------------------------------------
[0.886] henv=021E3C50, conn=021E3C80, status=1, num_stmts=16
[0.886] sock=021E20B0, stmts=021E2180, lobj_type=-999
[0.887] ---------------- Socket Info -------------------------------
[0.887] socket=560, reverse=0, errornumber=0, errormsg='(NULL)'
[0.887] buffer_in=35547096, buffer_out=35551200
[0.888] buffer_filled_in=6, buffer_filled_out=0, buffer_read_in=6
[8.195]conn=021E3C80, PGAPI_Disconnect

Всё, нашел проблему... 
Оказывается все дело в регистре.
По умолчанию конструктор VFP обращается к примеру так: autobizness.tb_client
Хотя название таблицы на сервере: tb_Client
Привел все названия на сервере к нижнему регистру и все заработало...
Пока вроде победил... копаем дальше