The login screen on Windows 10 appears as a uniform color now.
The login screen on Windows 10 appears as a uniform color now.
I've upgraded your Windows 10 system to the latest November release (version 10.0.10586). The original login background has been removed and replaced with a uniform blue color. There seems to be no straightforward way to restore the previous image without affecting other settings. You may need to use advanced troubleshooting steps or contact Microsoft support for further assistance.