To troubleshoot Group Policies not being applied to certain computers or users, it is helpful to complete a few basic steps:

1. Check the domain controllers for system instability or other issues.
2. Check the network connectivity to the user’s computer and other domain controllers.
3. Check the settings in Group Policy Management Console.
4. Check the Group Policy processing and event logs on both the users computer and the domain controllers.
5. Perform troubleshooting steps for complex scripts or logon scripts.