You have installed plugin which replaces default login form (not Invisible Defender). Please use FTP to login to your server, go to wp-content/plugins/ directory and find directory (or file) of that plugin. Next change its name to something else (or just remove it). When you do this, standard login form will be restored, so you should be able to login now. Login and go to the Invisible Defender options page, and disable protection for Login Form. Then you can restore name of plugin directory, which you changed earlier (or upload it again if you have removed it). You may also need to enable that plugin again (WordPress may deactivate it) and configure it. After you do this, please contact author of that conflicting plugin and tell him/her about this plugin conflict.
Some plugins allows to replace default registration and/or login forms. This can cause problems, when new registration and/or login forms doesn't calls appropriate hooks, which are used by Invisible Defender to add its hidden fields to the form. Invisible Defender uses following two hooks to add its hidden fields to registration and login forms:
<?php do_action('register_form'); ?>
<?php do_action('login_form'); ?>
Invisible defender uses comment_form hook to add its hidden fields to the comment form. This hook is called from template, so most probably your template does not do this. Check if your template has comments.php file (it should be in wp-content/themes/your-template/ directory). If you have it, check if somewhere inside element is following line:
<?php do_action('comment_form', $post->ID); ?>
If this line is missing, add it. You can also contact with template author and ask him/her for help.
You can also disable comments form protection on Invisible Defender options page.
This plugin is provided for free, so this link is the only way I can get credit from happy users. Of course you can disable it - just go to the plugin Options page, scroll to the bottom, uncheck 'Show "Protected by" link:' and save options.




