I have created a site collection and the owner reports back the permission he assigned to users wouldn't stay. They have reverted automatically back. Another case, any time one owner removed users, they re-appear after a few days, but not always in a predictable frequency. This is on MOSS 2007. Any idea what would have caused this kind of behaviors? Thanks!

Hi, Do you get any entries in ULS logs? Check your DB jobs whether they restore any backups. Do you have timer jobs created that interacts with site permissions? I hope this will help you out. Thanks, Rahul Rashu