I had been using WP Autoresponder And Newsletter Plugin (http://wordpress.org/extend/plugins/wp-responder-email-autoresponder-and-newsletter-plugin/) when this issue occurred. I tried to edit and save a newsletter which i had created but the values didn’t save.<!–more–> On debugging i found that the Newsletter Edit form’s hidden input element named “wpr_form” (before the hidden input element that contained newsletter id) missed the closing bracket. To fix this possible issue you need to open views/newsletter_form.php and edit the following code near line 71
<input type="hidden" name="wpr_form" value="<?php echo $wpr_form ?>"
to make it complete, i.e.
<input type="hidden" name="wpr_form" value="<?php echo $wpr_form ?>" />
Saving the newsletter should work now. In the meantime i am also writing to the author of this plugin so i hope when you read this post the issue is already fixed.