I refer this to enable the debugger in the PostgreSQL server in order to debugging the plpgsql function by stepping through the codes using the pgadmin.
I have already
Ken,
Have you tried pgAdmin 1.8 to rule out issue with PgAdmin 1.14/ PostgreSQL 8.3 interaction. It's been a while since I've used 8.3 and for the article I wrote -- which you are referring to, I was testing with 1.14/ PostgreSQL 9.1 so it could very well be an issue with the interaction with older version. Unfortunately I don't have a 8.3 anymore to test with.
I vaguely remember having the issue you had once, but it was when I had another shared library in my postgresql.conf in addition to the pldebugger. Can't remember which one that was, but removing the other shared library fixed my issue.
Hope some of these suggestions help, Regina