How to troubleshooting Group Policy

from:http://www.virtuallyimpossible.co.uk/how-to-use-the-group-policy-results-wizard/

First to do 

The ‘Group Policy Results Wizard’ is a great way to help troubleshoot any issues with Group Policy Objects (GPO). Here is how you run it on Windows Server 2008 R2.

1. Open Server Manager and expand Features > Group Policy Management > Forest.

2. Right-click on Group Policy Results and select Group Policy Results Wizard, then click Next:
   

3. Select the required computer and click Next:
   

4. Select a user account and click Next:
   

5. Confirm your selections and click Next:
   

6. The wizard will then gather the required data and you’re done:
   

7. You will be given the opportunity to change the name of the report:
   

8. The results can now be investigated by inspecting the Summary Tab:
   

9. Settings Tab:
   

10. and Policy Events Tab:
    

Using the ‘Group Policy Results Wizard’ should be the first task you complete when troubleshooting mischievous GPOs. I’ll post some other methods at a later date.

Group Policy Not Being Applied? 10 Things to Check

https://deployhappiness.com/top-10-ways-to-troubleshoot-group-policy/