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You may already have fixed this, I can see a topic from a month ago that seems to be the same issue. Emails are not being sent when a group announcement is made. The cause seems to be when it counts the number of members in the group, but uses a GROUP BY in the SQL causing it to get 1 as the count. I have commented out line 500 in com_community/models/groups.php:
JomSocial ActiveGURU ActivePublisher ActiveAdAgency ActiveiSEO ActiveSocialize Active
Hi
Thanks for report, We fixed the issue, and it will added in the next update of Jomsocial
Here are the details :
Path components/com_community/models/groups.php