I am doubtful this is it but check that you don't have a color filter [1] configured. [1] http://www.brucebnews.com/2017/11/look-at-the-red-flowers-windows-10-

I am doubtful this is it but check that you don't have a color filter [1] configured. [1] http://www.brucebnews.com/2017/11/look-at-the-red-flowers-windows-10-now-includes-help-for-color-blindness/ http://www.brucebnews.com/2017/11/look-at-the-red-flowers-wi...