is there a way you could post the .fla files up here? In a zip maybe if there are more....that way I can have a good look at it, I've seen the problem before...and I know solving it can be a reall pain in the ass.
I've eventually solved my problem by making a special function with actionscript called "rescale" I used it to exactly position the SPane, and put absolute high and width to it, that way it couldn't "rescale" itself as I already did....
But when I asked this over at kirupa.com, I got enough "variables" do keep my busy for the coming 20 weeks
so posting the .fla(s) is easier for the solving....