I'm running 1.3.7 and made the necessary updates this past summer for the USPS rate changes. I use USPS 1st Class and Priority and give the customer the choice. Everything has worked fine for many months. However, for the past week when a customer selects Priority, it reverts back to 1st Class.

I know about 1.3.8a, but need some time to test before doing the full upgrade.

Any ideas? Was there a USPS change that I'm unaware of?