If you get the error message:
Sorry, it seems that referer is absent or different from current domain.
every time you press your Passpack It! button, then there is a 99.999% chance your browser, a plugin, or a software installed on your computer is blocking (or "cloaking") your referrer information. Please check your list of plugins.
Firefox users
If you have made any custom changes to your profile, please check the network.http.sendRefererHeaderproperty. If it is set to 0, you must change it back to 1.