[Romamo]

If you have lost video thumbnails try this patch for 1.3.0.
Edit class_dm_video.php

PHP Code:

    function pre_save($doquery = true)
    {
        $this->thumbnail_save();

    function thumbnail_save()
    {
        require_once(DIR . '/includes/videoserviceapi/class_' . strtolower($this->fetch_field('videoservice')) . '.php');
        $classname = "vB_VideoSharingService_".$this->fetch_field('videoservice');

        $obj =& new $classname($this->registry);
        if ($obj->verify_service($this->fetch_field('videourl')))
        {
            if ($obj->prepare_data())
            {
                if ($obj->fetch_thumbnailpath())
                {
                    $obj->file_save_thumbnail();
                }
            }
        }

    } 


Edit & save each video with lost thumbnail.