[swapps]

I found the problem: The choosen mentorgroup MUST BE PRIMARY.
To get it working with a secondary group you should change in the Plugin "AWC-Welcome PM":

Find an Replace:

PHP Code:

$mentor_info = $this->dbobject->query_first(" 
                                SELECT userid, username  
                                FROM `".TABLE_PREFIX."user`  
                                WHERE usergroupid IN (".$this->registry->options['awcm_usergroups'].")  
                                ORDER BY RAND()  
                                LIMIT 1 
                            "); 


WITH:

PHP Code:

$mentor_info = $this->dbobject->query_first(" 
                                SELECT userid, username  
                                FROM `".TABLE_PREFIX."user`  
                                WHERE FIND_IN_SET(`".$this->registry->options['awcm_usergroups']."`, membergroupids)  
                                ORDER BY RAND()  
                                LIMIT 1 
                            "); 


This will only working with ONE defined group (without commas). You cant define more then one group in this hack.