Granted Privileges broken on RHEL 4 PostgreSQL 7.4.8

Here's what I get when I visit Granted Privileges in the PostgreSQL module:

select relname, relacl, pg_namespace.nspname from pg_class, pg_namespace where relnamespace = pg_namespace.oid and (relkind = 'r' OR relkind = 'S') and relname !~ '^pg_' order by relname : Unknown DBI error

System is up2date, and PostgreSQL module seems to work fine otherwise.