I'm setting up a fresh install of Magento 2.2 and I have everything ready to go, except when I put something in my cart and click "Proceed to Checkout", the page loads but hangs on the spinner.
I get the following error in the debug.log:
[2018-04-25 21:35:34] main.WARNING: Broken reference: No element found with ID 'checkout.header.wrapper'.  
If people want to see the issue, the test store is at:
Just try to check out an item.
You have issue with your browser cache , your checkout seems working fine. there is no issue at all.
Kindly clear your browser cache manually or else check in your browser 's private window.
I have checked the link you have posted and seems like order getting placed successfully - here is the order number for your reference - Your order # is: 000000003.
let me know if issue still persist at your end.
Yes, after I posted I found some comments on github regarding the issue with tracking.js blocking the checkout when Ad Blockers are turned on. By using the js tools in the developer section to combine and bundle the js, it fixed the issue.
Glad to know that you have resolved your issue !! Keep helping