[Steven Zahm]

@ Stefano

The issue was this was set in the wp-config.php file:
define('CN_IMAGE_BASE_URL', '/wp-content/connection_images/');

That would have been the incorrect base URL in the old Connections, not sure how that would have worked for you before … with the new Connections, that URL no longer is used which would cause the ERROR: The $img_path variable has not been set. error message.

After I remove that, Connections worked just fine.

Hope that helps!