title: ActionController::InvalidAuthenticityToken: verified with authentication token on the form
body: <p>I don't know why it happens but my form for some reason does not post properly. I am very sure the form contains the required authentication token:</p>
  
  <pre><code>&lt;form action="/account/complete_verify_email/4df78710-e27b-4527-bd2d-71cd2e9a1271" method="post"
      &lt;div style="margin:0;padding:0"&gt;
          &lt;input name="authenticity_token" type="hidden" value="341b07dfa682ed11a045e19956e2e3f5f499e8cb"&gt;
      &lt;/div&gt;
      &lt;input id="password" name="password" type="password"&gt;
      &lt;input name="commit" type="submit" value="Continue"&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>Note the authenticity_token is there. What happened?</p>
  
  <p><strong>Update:</strong>
  And YOU KNOW WHAT? Quitting Safari and restart again solved the issue... but I can't think of what kind of intermittent behaviour could cause such problem.</p>