Hello.
I just bought and install OPC for VM2 and tried working with the Three column Special Blue theme.
After adding a product to my cart I went to the checkout page, filled in all required fields and tried to submit payment only to find out that a message "Required field is missing".
Check out the screenshot as well.
If I choose some other cart then I don't get this message and payment is submitted.
Please let me know about it since this theme is one of the reasons I bought your plugin and it would be a shame not being able to use it.