I have been working on major updates for the UPS, USPS and Fedex shipping modules for a number of months now. Due to time constraints, I have not been able to upgrade these to work with the latest version of the shopping cart. If you have a cart version 188.8.131.52 or Earlier, I will be posting a patch for the common versions of the carts to upgrade you to the latest USPS and UPS modules.
To get a preview of some of the changes for USPS, check out my Wiki article here .
I am working on fleshing out this Wiki with common issues and requests and walk through instructions for setup. I know all too well the trial probably best portrayed by this XKCD comic .
I hope to have these patches published this weekend.
Do Not cross versions of the patch with different versions of the cart. The version listed is the absolute required version of the cart. This is due to a core file that must be updated and can cause problems if your versions are out of sync!