For example, we had about 2000 members to which we wanted to promote by creating a user group promotion with the only requirement of being part of the registered usergroup and being 'valid'. It would only select approximately 578 users total.
There was no reason for this to be happening, I even tried different requirements (just usergroup) or other parameters but it would consistently top out at a certain point. I had to resort to running a manual SQL query to promote my users, but having similar problems once again with awarding trophies. Is there some kind of timeout occuring that prevents all users from being selected?