I have used NGFB Open Graph successfully now on several sites. Lately however i am experiencing problems with the facebook sharing API (https://www.facebook.com/sharer/sharer.php)
When sharing a page, i get only the URL of the site and no image.
However, if i run that same page through the facebook open graph debug tool (https://developers.facebook.com/tools/debug/) and then share it again, then all info, image and text, is nicely available.
For every new page i have to run it once through the debug api and sharing works properly. What can be wrong?