gistfile1.diff

diff --git a/wp-content/plugins/custom-content-shortcode/includes/content.php b/wp-content/plugins/custom-content-shortcode/includes/content.php
index d707937..5b0b38a 100644
--- a/wp-content/plugins/custom-content-shortcode/includes/content.php
+++ b/wp-content/plugins/custom-content-shortcode/includes/content.php
@@ -971,7 +971,7 @@ class CCS_Content {
                $image_fields = array('image','image-full','image-link','image-link-self',
                        'thumbnail','thumbnail-link','thumbnail-link-self','gallery');
 
-               if ($field=='thumbnail')
+               if ($field=='thumbnail' && $parameters['size']==null)
                        $parameters['size'] = 'thumbnail';
 
                $attr = array();