USPS has recently updated their API so it would use V4 Rate. We have updated our shipping modules so it would met with this requirement.
If your site is using the HKProg Shipping module you may find your shipping is no longer working as it was built to use the old V2 system.
To resolve this issue, please download the following file patch: HK's Shipping Calculator patch
Once you have downloaded the zip file, please unzip and upload it to your site. This will replace the old file on your site.
WARNING:
Please ensure that you have made backup first, before applying this new patch.