Why woocommerce block checkout button on checkout page?

Question

I can't understand why woocommerce block this part of the screen by overlay block. In what cases is he can do it?

screen checkout page

Answer 1

Checkout contains several templates like totals & payment methods & addresses forms that updates in runtime via ajax.

When some part is updating, it adding blockOverlay until request will be complete. As checkout page is loaded, all parts are updating by calling $(body).trigger('update_checkout'). , that present at checkout.js

Infinite blocking overlay mark that there is some server error due request, so you need to check debug logs. Console probably contains 500 error also.