Hi Spinn,
Thanks for your post, I just install & check the version 1.3 its working fine.
Please check “Grid builder” tab under section “Grid Layout” you turn on display for “Thumbnail”
Please see the screenshots what i mean
http://i.imgur.com/Ouh76HA.png
Thanks
I have found a fix which solves this problem. If your images are still not showing after setting a featured image, you need to go into the plugin to edit it. Open the post-grid/grid-items/thumbnail.php file and comment out the following lines:
//if(!empty($external_thumb))
// {
// $thumb_url = $external_thumb;
// }
This is setting the image src to “Array”, which is evidently not an image url. Hope this helps. I would ask the developer to make the necessary changes for this fix or find a solution that works. You’re welcome.