Just realized I accidentally posted this to a resolved post.
I just installed this plugin and I’m having the same issue. I get the text for the recent posts, but the Like and Comments are just text links and no images will show. I have tried both Thumbnails and Normal and tried various widths and heights and even taking out the width/height specs altogether. Also there is a blank post at the very top of recent posts that makes no sense because it is also displaying our most recent post just fine.