Take alook at this article for details on the setup delegation wizard and the changes:
http://blogs.pointbridge.com/Blogs/schertz_jeff/Pages/Post.aspx?_ID=40If any non-default permission changes have been applied to OUs and objects in AD then that can cause problem with not being able to modify all properties of an object.
Jeff Schertz, PointBridge | MVP | MCITP: Enterprise Messaging | MCTS: OCS