What version of the List Subscribe plugin is being used? Versión 1.5.7
— What version of WordPress is being used? WordPress 4.7.2
— What is the name of the theme being used? INK
— Does the issue persist if you temporarily switch to a different theme? I switch but it didnt work
— What are the active plugins running on the site?
Envato WordPress Toolkit
Importador de WordPress
Jetpack by WordPress.com
Stag Custom Sidebars
StagTools
Subtitles
— If possible, could you try to deactivate all plugins except for the List Subscribe plugin to see if the issue persists when only the List Subscribe plugin is active? I also tried deactivating all plugins but I still cant see the success menssage.
What else do you think, Could be?
Thanks for your support.