Oh, Joy!!!!!! You aren't going to believe this.... but I GOT IT!!!!!
WHen I installed the USPS module, I didn't click "test" server because I am an optimist, thinking it will just work, and I had read some folks had problems with it, etc. So I ASSUMED I was put on Production server.
I had emailed USPS twice... one reply said they couldn't help with 3rd party software. THe other reply said they couldn't help, but if I sent my userID they would verify I was on Production. THis morning I get:
"Dear USPS Customer,
Congratulations on completing your testing using the U.S. Postal Service's
Internet Shipping Application Program Interfaces (APIs).
Your profile has been updated to allow you access to the Production Server.
And a bit more server info. I was surprised (since I had signed up for Production) but went ahead with a test order and....it WORKS! I am so happy!
So all you people call or email USPS, give them your userID and verify if you are on Production! It is bound to help some of you!
MrsD, dancing for joy!