because if I have scene A, which i use in scene B (by add>scenes>sceneA), and do the auto pp, both A and B get a pp-node, and scene B is not working anymore because the pp is applied twice.
\\Edit: well... we can just deactivate the node in scene A, and it wont get reactivated when the auto-pp-thing is toggled. so that's perfectly excluding that scene ^^. I guess I posted prematurely again.