title: Rails - InvalidAuthenticityToken
body: <p>I have a rails 2.3.10 app, from some reason some of my users are getting the following error: </p>
  
  <pre><code>ActionController::InvalidAuthenticityToken: ActionController::InvalidAuthenticityToken
  </code></pre>
  
  <p>full trace <a href="http://pastebin.com/cGd6gppu" rel="nofollow">here</a></p>
  
  <p>i've looked around and saw suggestions to add <code>skip_before_filter :verify_authenticity_token</code> to the application_controller.</p>
  
  <p>i've added it and and still no luck, still some of the users (not all of them) receive the error.</p>
  
  <p>any ideas?</p>