Access denied in "Configure member roles" tab

When Founder group access to "Configure member roles" tab show "Access denied". The founder group can "create/remove" users of rol in "og/users/nid" but can not access to "Configure member roles" tab.

http://drupal.org/node/177948 say:

Then set an even more negative weight for the OG User Roles module:
UPDATE system SET weight = -20 WHERE type = 'module' AND name = 'og_user_roles';

I did it, but this does not work.

I set "Clear the user_access() and cache_menu caches for user?" in "admin/og/og_user_roles".

NOTE: I use Drupal 6.15 and og user roles 1.5.

Help me please. Happy new year.

Thank you.