Reproducable.
Grab upper edge of unity-greeter with alt+left mouse and drag it around.
Result:
Another unity-greeter is displayed underneath.
The images can change in number after each log-out, main image, second image with login-box on the left or main image, second image with login-box on the right and a third image underneath the two.
Reproducable.
Grab upper edge of unity-greeter with alt+left mouse and drag it around.
Result:
Another unity-greeter is displayed underneath.
The images can change in number after each log-out, main image, second image with login-box on the left or main image, second image with login-box on the right and a third image underneath the two.