by GPNMilano » Sat Mar 28, 2009 11:48 am
The only time blender won't clean up a loose node itself is if you tell it to. Next to the names of the materials, textures, sounds, ipo curves etc there is a button that when pressed asks you if you wish to save that data even if it has no users. Choosing yes will create an empty link node so that Blender will not delete that node. Once unpressed though it will return to its default setting of deleting it.