Solved!

Thank you for the reply.

After running an ODBC debugger and closely examining the ODBC logs, it appears that there is a part of 'their' driver that doesn't like mapped drives. Frankly, Neither do I.

How I managed to not notice that this ODBC DSN was set up using a mapped drive is beyond me. I know better.. must have been a slip in sanity.

Thank you for pointing me in the right direction!

Regards

Victor