The Do not allow Flip3D invocation machine setting should be configured correctly. Flip3D is a 3D window switcher. If you enable this setting, Flip3D will be inaccessible. If you disable or do not configure this policy setting, Flip3D will be accessible, if desktop composition is turned on. Changing this setting will require a logoff for it to be applied. Fix: (1) GPO: Computer Configuration\Administrative Templates\Windows Components\Desktop Window Manager\Do not allow Flip3D invocation (2) KEY: HKLM\SOFTWARE\Policies\Microsoft\Windows\DWM\DisallowFlip3d