I have poser 5 with SR4, render over backround shader in a render settings, I have a backround picture node in a "Material Room". When render a image file, everything is fine. But, when render an AVI file, the backround shader not appear, just appear the backround color. I solved this problem importing a backround image from "File/Import/Bacround Picture and an AVI file display the backround picure fine. How can fix the problem with the backround picture node or others nodes for more control in a scenes? Thanks. Sorry for my bad English.