I have migrated an existing installation to a new server followed by an upgrade to 4.7.31.
When creating a new mailing I keep getting "No recipients" when I add groups or smartgroups. If I add recipients of past mailings, it works as expected (I get xx recipients).
In the database - the table civicrm_mailing_group gets a new record (so OK) - the table civicrm_mailing_recipients does not get new records added.
So the problem seems to be related to populating the civicrm_mailing_recipients table. How do I debug/solve this?