Strange client encoding issue

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I am encountering a very strange client encoding issue.
From the logs on the server, I am getting the following:
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canopy02# tail postgresql-2008-01-16_000000.log
2008-01-16 15:20:03 ESTERROR: conversion between latin9 and LATIN1 is
not supported
2008-01-16 15:20:03 ESTSTATEMENT: set client_encoding to 'latin9'
2008-01-16 15:20:06 ESTLOG: connection received: host=3D192.168.111.25
port=3D4236
2008-01-16 15:20:06 ESTLOG: connection authorized: user=3Dpostgres
database=3Dishield
2008-01-16 15:20:06 ESTERROR: conversion between latin9 and LATIN1 is
not supported
2008-01-16 15:20:06 ESTSTATEMENT: set client_encoding to 'latin9'
2008-01-16 15:20:11 ESTLOG: connection received: host=3D192.168.111.25
port=3D4253
2008-01-16 15:20:11 ESTLOG: connection authorized: user=3Dpostgres
database=3Dishield
2008-01-16 15:20:11 ESTERROR: conversion between latin9 and LATIN1 is
not supported
2008-01-16 15:20:11 ESTSTATEMENT: set client_encoding to 'latin9'

The application logging data is using the PostgreSQL ANSI ODBC driver,
version 08.01.02.00.
Database server is PostgreSQL 8.2.5 on i386-portbld-freebsd6.2, compiled
by GCC cc (GCC) 3.4.6 [FreeBSD] 20060305
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On page 2 of the datasources tab, in the Connect Settings tab, I have
the following:
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set client_encoding to 'latin1';
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to force the encoding.
Any ideas on what may be creating this, and how to resolve it?
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