Bug! Checkout not working w/update. Everybody using https on your checkout please test your site!

YIKES…checkout not even working after the latest update.

Just upgraded to version:

Clicking “next step” in the checkout area in the “step 1” yields an infinite spinner.

Upon checking the console there is an error message that says:

Mixed Content: The page at ‘https://www.bombfirst.biz/store/checkout/’ was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint ‘http://www.myblogsitemappeddomain.com/wp-admin/admin-ajax.php?action=mp_update_checkout_data’. This request has been blocked; the content must be served over HTTPS.send @ jquery-1.11.1.min.js:4

I am using Version 4.4.1.0 of Domain mapping. And using Version 3.0.0.6 of Marketpress

NGINX server, multi-site install

Looking forward to a quick and speedy solution. Thank you. Support access opened.