On some 3.7.10 R3 carts the OPC page will timeout when trying to generate a shipping rate. Also, values over 999 were not showing commas. The attached file fixes both of these issues
The Fix:
- Download the attached opc.js file
- Upload the file to /content/engine/design/javascript/, replacing the existing file there
- Go to Cart Settings -> Appearance Settings and click the Clear Skin Cache link
- Click on the link to activate the Cart Designer and once the designer loads click the Exit button
