I'll try to keep this as simple as I can:
I made a couple of posts yesterday with both a featured image and zemanta related posts inserted. Now I'm writing a post today and yesterday's posts are appearing in my 'related posts' widget while I write my post. However, my related posts that appear in the widget have a thumbnail that is from a related post rather than the featured image itself.
Is this because the featured image is not in the post's copy but hard-coded into the template using the_post_thumbnail();?
This isn't very game-breaking but it's misrepresenting my blog to people who might want to link their posts to mine.