I took a powerpoint file that I had used to create my transparent background slides on my old computer. I did the right click - saveas picture. I now have the powerpoint same file with the origin png saved on old computer and one made in identical way on new computer. PNG from old computer worked fine on video editing program, same thing done on new computer has solid background that covers the layers underneath. It's the new version of powerpoint or Windows 10 or ?? or ?? or ??