If it only happens sporadically for some users it's probably caused by 
an ActionController::InvalidAuthenticityToken which again is caused by 
disabled cookies in the users browser.

You can handle these errors by adding this to your application 
controller:

rescue_from ActionController::InvalidAuthenticityToken, :with => 
:handle_token_issues

def handle_token_issues
  redirect_to(somewhere) #redirect to page for handling this issue
end

If this were a problem caused by wrong protect_from_forgery settings I 
think it would also show up in development.
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