I have had a few instances where GPO's have been updated and a gpupdate /force tells me it has applied the policies successfully but upon closer inspection some of the new settings have not been applied.
reboot and your computer pulls down the latest version of GPO.
Have you ever applied a Group Policy and then waited the standard 90 minutes for the setting to apply only to find out that after a few hours the policy still has not been set yet.
Even trying to force a GPUPDATE still does not trigger the change but then the next day the policy has applied as expected. This is a situation that is commonly caused if you are using security group filtering for applying policy settings.
Delete the "HKCU\Software\Microsoft\Windows\Current Version\Policies" Key. No internet connection is required for this solution, but the link needs to be up, and it needs to have an IP address. If you are still logging into an account that was used while it was on the domain, chances are it hasnt been removed from the domain.
Group policy will apply if it is a domain account, regardless of physical connection to the network that the domain resides on.