odbc with PostgreSQL 8.0 & Delphi

Hi all

I recently migrated to PostgreSQL 8.0 but I have now a problem acessing
database through Delphi with psql-odbc. When I try to access any string
value, I always get an error (EDatabaseError). My settings for the
DataSource are the following :

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Disable Genetic Optimizer: on
KSQO : on
Recognize unique index : on
Text as LongVarChar : on
Unknown as LongVarChar : on
Bool as Char : on
Max VarChar: 254
Cache Size : 100
Max LongVarChar : 8190
SysTables Prefixes : dd_
LF <-> CRLF conversion : on
Updatable cursors: on
Int8 as : default
Protocol : 7.X, 6.4+
Anything else : off
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Any hint on how I could resolve my problem would be really appreciated.

Thanks

Melanie