App "G" preventing shutdown or restart

Question

After updating my Windows 10 to creators update (build 15063.138) when I restart or shutdown the PC a screen appears and shows a 'G' app which is preventing the operation.

Is there a way to determine which application it is, or find out more details about it?

I do not see any "g" running process or installed application in my system.

Solution

Process Monitor will give you much more information about what is running and what those processes are doing.

https://docs.microsoft.com/en-us/sysinternals/downloads/procmon

1. Begin the shutdown
2. Cancel once hung
3. Run Process Monitor and see what is going on.

Then enable verbose shutdown messages:

1. Run gpedit.msc from the Start menu search
2. Go to Computer Configuration > Administrative Templates > System
3. In the right pane, double-click on Verbose vs normal status messages

You can also get detailed information about shutdown using the Windows SDK:

Windows Performance Toolkit