I'm having the same problem as this forum topic poster: http://en.forums.wordpress.com/topic/featured-image-not-showing-up-1?replies=2#post-735816. I'm using Structure as my theme as it has been working wonderfully, up until about two months ago. Then all of a sudden, random posts that I uploaded months before were all of a sudden missing the featured images on their post. The image shows up in the homepage preview but not when you click on the post.
I uploaded two new posts since then and those images appear where they are supposed to. I'm creating one now though and in the preview I'm not seeing the feature image that it says I've just uploaded. This is extremely frustrated since I've kept the format, size and other specs uniformly the same on all my feature photos and don't understand what's going on. Please help!! Thanks!
My Blog is: http://alexclermont.wordpress.com/
The blog I need help with is alexclermont.wordpress.com.