If you have an article wich is copy/paste from another wordpress blog, the system fail at generating a thumbnail.
To fix that, you just have to skip this detection in the "apt_publish_post" function (near lines 260) :
/** * If the image is from wordpress's own media gallery, then it appends the thumbmail id to a css class. * Look for this id in the IMG tag. */ // preg_match('/wp-image-([\d]*)/i', $image, $thumb_id); // $thumb_id = $thumb_id;
I think there is a cleaner way to correct it (by checking the domain of the image and compare it to your own, for exemple), but I don't know WordPress well enough to make it work the right way...