Colored screen bug.

[Deolrin]

I'm not sure if it's a bug, but...
When a night started, the screen went gray\white, and then faded to green and finally after one 'blink' or camera-switch or camera change it reverted to normal, much like the color screens when someone is being killed by a gas chamber.

[Dark.Revenant]

That would be the camera. During the day it's a shitty security cam, during the night it's a night vision cam. It fades from white to green during the start of the night.