I've always used powerpress and never had problem. I came back to wordpress world after a two years break and I don't know what is happening.
I've tried to use the main podcast option (using the media/poster image) and even to mount the feed using category/feedburner and both are not presenting my podcast artwork. Only after download the episode it is appearing and I remember this was not the way I had before. I also have the same image on my post. Any thoughts?