Brief
We have updated the script usps_v3.php to calculate correct prices.
 
Description
When you specify how many items should fit in one package in Products > Top > Edit Product > 'Stock & Shipping' tab > 'Number of Packages' field the shipping prices were calculated incorrectly. For example, you could put "0.33" value in 'Number of Packages' field to fit 3 products in one package but instead on checkout the price was calculated for three packages.
 
Solution
Download the updated version of the file:
http://www.viart.com/downloads/usps_v3-3.6.zip
 
Further, extract the file into the 'shipping' folder of your shop replacing an existing one. Do not forget to make a backup copy of the current file in case something goes wrong.