Upgraded to plugin V 3.1 using WP 3.2.1 (Multisite) & BP 1.5.1., network activated. Cannot find Welcome pack settings pages under Network admin > settings or Buddypress menu. Additionally, welcome email and previous settings (join group/add friend) are no longer working.
Previously had the same issue with an older version of the plugin (think with BP 1.2.6 > 1.2.. However, at that time, even though the settings page was missing, the plugin still functioned based on the previous settings.