– "Warning: Cannot modify header information – headers already sent by (output started at /wp-admin/includes/template.php:1867) in /wp-content/plugins/nextend-smart-slider2-full/library/smartslider/admin/controllers/sliders.php on line 408" error message.
– Can't use slide editor.
– Website's code seems messed up.
– Can't click on buttons in the backend.
– Save doesn't work.