When I click 'proceed to checkout' button in my store xxx.com/cart page, It just refreshes the page.
It's so confusing!
I used the newest Wokiee theme.
Then I checked the POST data of the http request, I found the 'checkout' field was missing:
address[country]: United States
address[zip]: Zip/Postal Code
checkout: // this field is missing compared with normal submission
But it was ok a few days ago, does some plugins I added made the error?