Text field truncation problem

I am trying to sort out a problem with ODBC truncating text fields.

I am running Postgres 7.2.3, and using the latest ODBC driver from the
official website. 

When I connect through the windows client I get the message: 

Test2.pl: DBD::ODBC::st fetchrow_hashref failed: Fetched item was
truncated. (SQL-01004)(DBD: st_fetch/SQLFetch (long truncated) err=1)

I have attached the log from the ODBC if that is any use.

Many thanks 

Graham.