HTML Button Not Working/Disabled

Have you tried:

– deactivating all plugins to see if this resolves the problem? If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the default theme to rule out any theme-related problems?

– resetting the plugins folder by FTP or phpMyAdmin? Sometimes, an apparently inactive plugin can still cause problems.

The WYSIWYG editor can loose functionality if you deregister the WordPress default jQuery via:

wp_deregister_script( 'jquery' );

In fact a lot of screwy things can happen to the admin when you do this. However, lot’s of us want to use our own version of jQuery for our themes / plugins. The solution is to deregister the default jQuery only if the admin is not active. To do this, put the following in your theme’s functions.php file:

if(!is_admin()) {
   wp_deregister_script( 'jquery' );
   wp_register_script('jquery', '/your/server/path/to/jquery.js');
}

Now, you can put

wp_enqueue_script('jquery');

in your header.php file and it will call your preferred jQuery version for your theme, but the admin will utilize the default jQuery as it’s designers intended.