Ajax stops working when logged in?

A few things that I see:

  1. There’s a space in your first add_action declaration. Should be add_action('wp_ajax_wppl_function', 'wppl_function');
  2. Have you declared wppl_function to run it?
  3. Have you localized your scripts when logged in? Please review the codex entry on wp_ajax_nopriv (action)

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