Issue GPO User Disable/Enable CD device access (re-enable problem)

Hello,

I've a problem with User GPO. I need enable and disable CD/DVD access to user groups.

When I enable GPO for Disable CD/DVD Access, it works fine (the user cannot access to CD/DVD device), but if I want enable access to this resource again, it doesn't work IN THE SAME MACHINE. If user access in another computer, he have access to CD/DVD device.

There are: User Configuration - Policies - Administrative Template - System - Removable Storage Access - CD and DVD: Deny read access/CD and DVD: Deny write access

DCs: Windows 2008 R2 (English)

Client: Windows 7 Pro (English)

Any suggestion.. ???

Regards,

Pedro