I was previously unable to proceed from my cart, the admin team has since resolved the issue. According to their response, the issue persisted until today and was fixed around noon. It's unclear whether it was user-specific or affected a broader region. It may be worth reaching out to the email I mentioned above for further clarification.
I have used Chrome.
FYI., There was a major update during last week's site maintenance, since then we are running into these issues.
