I spotted out the answer for this.
Here is the culprit the culprit: the jquery.animate-enhanced.js file that had been added since version 3.1.2 is creating the issue.
Comment out this line :
wp_register_script('jquery_animate_enhanced', content_url().'/plugins/wp-supersized/js/jquery.animate-enhanced.min.js',array('jquery'),self::supersized_jquery_animate_enhanced_version)
probably on line 55 in this file:
wp-content/plugins/wp-supersized/includes/WPSupersized.php
This is working for me now.