Administrator unable to access folder

What will cause Win2K to have folders existing that the Administrator can not open? This happened with two user folders that we copied from the previous Novell server. Both folders could only be opened by loggin on with the username and password they were assigned to. As Win2K Administrator I could not open those folders. I created new folders, copied the files, deleted the old folder and renamed the new folders. After that access was normal.

More recently I could not, as Adminstrator, rename a folder on the server. What causes this?