The Always use custom logon background machine setting should be configured correctly. Ignores Windows Logon Background. This policy setting may be used to make Windows give preference to a custom logon background. If you enable this policy setting, the logon screen will always attempt to load a custom background instead of the Windows-branded logon background. If you disable or do not configure this policy setting, Windows will use the default Windows logon background or custom background. Fix: (1) GPO: Computer Configuration\Administrative Templates\System\Logon\Always use custom logon background (2) KEY: HKLM\Software\Policies\Microsoft\Windows\System\UseOEMBackground