If you add a user as a member of the Contributor/Approver/Hierarchy Manager/Owner group in Office SharePoint Server 2007, the user can use the Copy option for SharePoint sites. When this user tries to copy a sub site to another destination in the same site collection, they may experience different errors, depending on the user permission.
To resolve this issue, apply the following update:
982338 Description of the Microsoft Office SharePoint Server 2007 hotfix package (Coreserver-x-none.msp, Coreservermui-en-us.msp): April 27, 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.