I'm using a slightly older version of AutoTweetNG (8.5) on the latest joomla version, and it has been working fine until a few days ago.
Suddenly the images are not posting on facebook. Not even the alternative image.
After I post my article, the image shows in the composer view of AutoTweetNG but it doesn't show in the successful posts list.
I've tried the Sharing Debugger and it does show a few warnings like og:image missing but these were there before, and the whole thing was working fine.
Nothing has changed recently on the website, except one thing. The hosting provider has forced the use of https on the administration site (temporarily for security reasons) - no matter if the website is using ssl or not.