Chouby on "[Plugin: Polylang] posts only display titles, no content"

You can reset your file single.php.
The problem is coming from the function 'responsive_post_meta_data' but what is very strange is that all the fonctions called by 'responsive_post_meta_data' are working as expected (this what we just tested).

Could you open the responsive/includes/functions.php, go to line 350 and post the content of the function 'responsive_post_meta_data' between

if (!function_exists('responsive_post_meta_data')) :

and

endif;