Hi!
I solved this problem executing the following sentence into PhpMyAdmin
INSERT INTO wpt2_bpges_subscriptions
(user_id, group_id, <code>type</code>)
select wbgm.user_id, wbgm.group_id, 'sum'
from wpt2_bp_groups_members wbgm
where not exists ( select 1 from wpt2_bpges_subscriptions wbs where wbs.user_id = wbgm.user_id and wbs.group_id = wbgm.group_id)
This force the subscription for all the users in all groups to weekly email summary.
