Hi, could you edit the file plugins / acymailing / civicrm / civicrm.php and invert the lines 1358 and 1359 then give it another try?
It should look like this:
elseif($table == 'civicrm_country'){
if(!in_array('civicrm_state_province', array_keys($search->select_tables))) $query->leftjoin[] = $this->civiprefix.'state_province AS civicrm_state_province ON civicrm_state_province.id = civicrm_address.state_province_id ';
$query->leftjoin[] = $this->civiprefix.'country AS civicrm_country ON civicrm_state_province.country_id = civicrm_country.id ';
}elseif($table == 'civicrm_worldregion')