Quote Originally Posted by katrobb View Post
I installed one_page_checkout-2.4.6, on ZC 1.5.7d, and I am using westminster_new_2.1 template.
When I click on "Confirm Order", the program does not process order. I found a thread about someone having the same problem using 1.5.5, but it did not seem to apply to 1.5.7d. It doesn't matter which payment selection I try. The button changes on hover and shows the hand pointer. It just doesn't do anything else. No error messages. I do not see any errors in the logs either.

Does OPC work with westminster_new_2.1?
Could you please give me advice on how to proceed?
That westminster_new template, despite its name, is very old. It might not load a compatible version of jQuery. You can check by (on a Windows computer), pressing the F12 key while you're viewing your site's checkout_one page and then clicking on the "Console" tab. OPC's jQuery will (if able) write status messages to the console, but if jQuery isn't loaded you'll see a console error message to that effect.