I have a global security group in a windows 2003 AD environment, we have 2 dc’s, I have added to users to a group and there are 5 users in this group. In the morning 2 of the users are gone from the group. I follow the steps of adding them in and the next morning they are gone. I have auditing enabled for both success and failure for group changes and there are no entries which from my reading should be eventid 633. I think this may be a replication issue with our AD. Any thoughts on this or how would a person go about looking closer into the AD part.