Hello,
I am having the same issue too. The shipping is not working on both of my sites. They were previously working for over a year now so they are in production. I have resinstalled the module and set the debugging. The email just talks about what you can ship. Here's an example.
(You can turn off this debug email by editing your USPS module settings in the admin area of your store.)
<?xml version="1.0"?>
<IntlRateResponse><Package ID="0"><Prohibitions>Arms; ammunition; weapons; parts and components of weapons; and other related equipment.
Coins; banknotes; currency notes (paper money); traveler's checks; securities payable to bearer; platinum, gold or silver, manufactured or not; precious stones; jewelry; and other valuable articles except in insured Priority Mail International parcels.
Foodstuffs containing saccharine in any amount.
Human remains.
Live plants and animals.
Perishable infectious biological substances.
Playing cards.
Radioactive materials.
Tobacco (admitted only to the Canary Islands, Ceuta, and Melilla).</Prohibitions>
Any ideas? Any help is greatly appreciated.
Lindsay