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I looked in FAQ and could not find any matches, so I posted this, Then the answer appeared. I found the answer.
the cURL proxy status was set to TRUE. I did not change it, but I changed it to...

Zencart version 1.39h
Paypal previously working suddenly stopped
No changes made to Zencart installation

complete error code
An error occurred when we tried to contact the payment processor....

Installed USPS Shipping Module - RateV4, IntlRateV2
The estimator and the shipping module both estimate the weight at 4 lbs even though it is one pound. Please advise.