When cloning a user, Username field is filled as null and a user is created in IE8.0.6001, vista sp2. The username field is blank in firefox and doesn't let you create a user without information.
After that you can clone any user and null users are created without any error message but only the original user null stays with original settings. The others don't appear in users list.
EDIT1: The same applies to groups when cloned. A null group is created.
EDIT2: In goups once null is created, you can't create another group and you do get an error that the item with same name already exists.
EDIT3: Ok it seems that null user is only cloned if you had existing users. If you create a new user with 7.470, a null user is created but doesn't show up in the list.
