I recently had one of my clients websites run into a rather interesting issue. The client is running a WordPress based e-commerce site using the WP e-Commerce plugin to run the store and suddenly no one could buy anything.
Adding a product to the cart worked fine, shipping rates came over fine but once you clicked purchase, the checkout page just refreshed. One thing I noticed right away, was that the shipping total was no longer carrying over to the total at the bottom of the checkout page.
I started doing some research on this issue. I first went to the WP e-Commerce forums to see if I could find something there. (As I side note, I really dislike their forum). Next I hit up the Google Machine and what do you know? I found quite a few people having the same problem. After a few hours of chasing rainbows looking for me pot o’gold, I gave in and emailed Greg at ECS Quest looking for help. You may be wondering at this point, who is Greg? Well, I kept coming across his posts where he was stating he had a fix but wasn’t giving up the goods. Also, Greg is the guy that wrote the UPS and USPS shipping modules that come with WP e-Commerce. From what I can tell he is a great guy and he did a fantastic job with the new USPS and UPS shipping modules.