Featured image not displaying

It’s because there’s no filter defined for ‘focuswp_thumb_size’ from functions.shortcodes.php, line 177.

So I changed the code for the slide_image function to:

function slide_image( $array ){
		    if( isset( $array['type'] ) && 'featured--on' == $array['type'] ){
		        if( has_post_thumbnail( $array['item']->ID ) ){
		            echo '<a href="'. get_permalink( $array['item'] ) .'" />';
						echo get_the_post_thumbnail( $array['item']->ID);
					echo '</a>';
				}else{
					return false;
				}
			}else{
				return false;
			}
		} 

Please add the filter to your next release so that it fixes this issue.