hhmmm.. it may be associated to some problem with postgresql_db_dump.sql.. I'll take a look. Any problems that I may find I'll comment here.
Anyway, you can bypass it inserting the roles by hand. Run this query:
Just be sure that the Admin user has the user_id == 1 and that an association to group_id == 2 ( Administrators ) exist at jforum_user_groups. Probably you'll need to restart Tomcat, but just closing the browser and opening it again may work as well.
Rafael [originally posted on jforum.net by Rafael Steil]