Group Policy and SVS Layers
It is important to remember that SVS layers are still subject to Group Policies, even though the layer may be activated after the application of the policies.
A local cache of the Group Policies are held on the local machine when a member of an Active Directory and remain in force for the duration of the refresh interval.
Local policies are stored locally -- if you ever get into a situation of difficulty i.e. you lock yourself out, simply delete the %systemroot%\System32\GroupPolicy folder (on the system) and log back on.
When you activate a layer, the Windows OS will still enforce the GPO settings, even if you have specified different settings in the layer.
This is important to remember when testing and troubleshooting. Before you go nuts trying to figure out why, take a look at the GPOs to ensure this is not the problem.