Part of a Domain, Black Background

I need some help with windows 7 pro machines we are adding to our domain.

We are running server 2008, with a policy to set the background image.

We have windows vista machines that display the login background when logged into the domain, but when we login with the windows 7 machines, it displays a black background. when we log out it displays our custom work wallpaper as the logout wallpaper.

I do not think it is a group policy problem on the server (I literally have checked every nook and corner), but a windows 7 problem.

I have searched the MSDN for answers and have been unsuccessful. Does anyone have a clue on what is wrong?

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