[R] Possible bug in screen ?

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Hi all,
after choosen the plot in witch I want to draw a point, just the first 
plot draws the point
Is it a bug or just a user-problem ?

Example :
split.screen(c(2,1))
screen(1)
plot(1:10)
screen(2)
plot(10:100)

screen(n=1, new=F)
points(4,3, col="red")
screen(n=2, new=F)
points(20,20, col="red")

screen(n=1, new=F)
points(6,6, col="red")
screen(n=2, new=F)
points(80,80, col="red")


Thanks for help.

Greetings