Okay, I didn’t want to wait as we go live with our blog on Monday. So a quick fix was applied by adding “page-header-post-image” to the surrounding DIVs Class tag in blog/wp-content/plugins/gp-premium/addons/generate-blog/inc/functions.php line 93. Or simply search my above mentioned blogs main page HTML code, and search for “tobi temp fix”. However, a proper fix would be very much appreciated. Thanks!
p.s.
Just for re-production: the problem occurs only if your set the Feature image on the right hand side widget (called Feature Image) while editing a post. If you set the image in the larger area just below the content editing area called “Page Header” the problem does not exist.
However this is no valid workaround as the flag called “Add to blog excerpt” in this area does not work correctly, so the picture is not used when Sharing the post.