I'm having a similar problem. I'm broadcasting from the sub-sites to my main blog. When I set a featured image on my sub-site and broadcast to my main site the image shows up in my main site's media library but not as a featured image on the broadcasted post. Since the images are in the media gallery I can manually set the image as the featured image on the post in the main blog but I would really like to avoid doing that as I am anticipating a number of sub-blogs and would love for this to be automated. Any help that you can give to either tell me what I'm doing wrong or fixing the plugin would be greatly appreciated.
This is the perfect plugin for what I'm doing in every other way, I just really need the featured images to come through as featured images not just media gallery images.