Migration wizard cannot connect via ODBC

I'm trying to copy the data in a MySQL database over to a PostgreSQL 
database.  I'm running:

- mysql 3.23.57-nt under Windows XP
- PostgreSQL 7.3.3 under FreeBSD 4.8
- pgAdmin II 1.4.12

Here are my steps:

1 - Connect to my pg db
2 - Select menu item Plugins -> Database Migration Wizard
3 - click on ODBC
4 - From the Datasource drop down list box, select the ODBC database
5 - type in the user name (root)
5 - click on Next

It it then that I get the lovely Windows message "pgAdmin II has 
encountered a problem and needs to close.  We are sorry for 
inconvenience."

If I suppy the wrong user name (e.g. rooted), I get an access denied 
message.

Through the control panel, I have confirmed that the ODBC connection 
works by clicking on the "Test Data Source" button. I've taken scree 
shots of the various ODBC settings:

http://beta.freebsddiary.org/tmp/odbc-main.jpg
http://beta.freebsddiary.org/tmp/odbc-options.jpg
http://beta.freebsddiary.org/tmp/odbc-test.jpg

Any ideas?  Thanks.
-- 
Dan Langille : http://www.langille.org/