Same, there is absense of color for a tenth of a second and you automatically see green
EDIT: oops nvm, the green dot overlaps the pink and turns grey because it is moving so quick that your eye won't be able to see the shifting in time, so you see nothing but gray when you look at the center for about 7 seconds, hint: DONT BLINK or the process will have to be restarted
For the people that don't see the dots disappearing, just focus straight on the black cross. Don't even think about blinking or you'll see the dots again. They disappeared for me after mere seconds.