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Ruby on rails captcha stop working
<h2>Open Account</h2>

<%= form_for(resource, :validate => true, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
  <%= devise_error_messages! %>
  <br />
  <%= render 'user_fields', :f => f %>

  <%= f.fields_for :accounts do |builder| %>
  <p><div><b>Account</b></div></p>
  <%= render 'accounts/form_fields', :f => builder %>
  <% end %>

  <div><%= f.label :password %></div>
  <div><%= f.password_field :password %></div>

  <div><%= f.label :password_confirmation %></div>
  <div><%= f.password_field :password_confirmation %></div>
 <% if !Rails.env.test? %>
  <p><%= recaptcha_tags %></p>
  <% end %>
  <div><%= f.submit "Sign up" %></div>
<% end %>
<br />
<%= render :partial => "devise/shared/links" %>