multiple plot

hi there
i've got this litle strange problem working with multiple plots i one screen
the title dissapears when more than 4 images comes up
up to 4 plots the title it shows nicely

the display is set up like:

split.screen(figs=c(3,4), erase=TRUE)

some plots

close.screen(all=T)

title(main='TITLE 1')

what am i doing wrong here

regards soren