Element with Alpha Channel is not showig in D Resolve Fusion

Hello fellows. I’ve downloaded several elements with alpha channel but some of them aren’t showing in the fusion page. I’ve changed the ‘clip attributes’ to ‘premultiplied’, ‘straight’ or ‘invert’ without success. I’ve also changed the ‘field dominance’ and nothing. It is important to say that some elements does show but other does not. Anyone can help? Thanks.