Permission denied: LOCK TABLE test.__proc IN ACCESS SHARE MODE

Hi. I was checking out the idea that Tom Lane kindly gave me in his
reply to an earlier post, and I'm running into a strange error when I
run pg_dump:

pg_dump: SQL command failed
pg_dump: Error message from server: ERROR: permission denied for schema test
pg_dump: The command was: LOCK TABLE test.__proc IN ACCESS SHARE MODE

The thing is that neither the schema test nor the relation test.__proc
exists any longer!

How do I fix this?

Thanks!

kj