Strange behaviour of ytitle()

Hi all,

I find ytitle() to behave quite strangely ; the first link points to a figure
to each left subplot of which I used

  ylabel(labl)

and on the figure pointed by the second link I used

  text(-0.07,0.5,labl,verticalalignment='center',
  rotation='vertical',transform=gca().transAxes,clip_on=False)

http://nicolasgirard.nerim.net/ytitle.jpg
http://nicolasgirard.nerim.net/text.jpg

from these 2 samples it seems like ytitle()'s behaviour is odd, or at least
not optimal. What do you think ?

cheers,
nicolas