I'm having the same problem, none of my posts have posted to my FB wall for about 2 weeks now. I've disconnected the app's on both FB and WP and reconnected them, they both say they are connected but nothing posts.
When I am typing a new post I check the boxes where I want the post to be shared, FB, Twitter, Tumblr and once I hit publish and it refreshes all but FB are checked and it has published to all but FB.
This is new, it was working flawlessly in the past. Any help would be appreciated!
Blog I need help with PaintedByTheSun