Issues one and two are clear signs of the broken WP Cron.
>> Facebook new [bigger] shared link thumbnail images â€“ DOESNâ€™T WORK
Sorry, but it can’t be. 🙂
If you read the post you see that this feature possible only if you check “Let Facebook fill the link info” checkbox. This basically means that if this checkbox is set plugin just does NOTHING. It just tells the the Facebook – “Here is the URL to share – do whatever you like with it”. There is noting else. Nothing could be broken, nothing for us to fix.
If you don’t see the big thumbnail then your link doesn’t meet the Facebook requirements for big thumbnails.
There are several:
– link MUST be shared, not attached.
– page must have og: meta tags.
– og:image meta tag must be set and contain the correct image URL.
– size of the image listed in og:image meta tag should be minimum is 560x292px, recommended 1200x627px.