My USPS Autofill has stopped working. I just checked my install and I am using v1.3 for ZC 1.38.
The ParseIt() function in the modules/usps_autofill_button.php line 122 reads:
Code:
function ParseIt() {
  //document.forms['labelInformationForm'].submit();
  document.getElementById('labelInformationForm').submit();
  //window.history.go(-1)
}
</script>
<script src="https://sss-web.usps.com/cns/jscript/labelInformation.js"></script>

<form target="_blank" method="post" action="https://sss-web.usps.com/cns/labelInformation.do" name="labelInformationForm" id="labelInformationForm">
but https://sss-web.usps.com/cns/labelInformation.do is the "sign-on" page for USPS.
The actual label info is on https://sss-web.usps.com/cns/labelSubmit.do if you just hit the "Go" button on the signon page or on https://sss-web.usps.com/cns/signinLanding.do if you sign in first. However changing to either of these two new URLs does NOT solve the problem and only brings you to the sign on page, even if you sign in first and then hit the Autofill button. Bummer .