Cornerstone cannot be loaded

I face a problem with loading Cornestone (Via visit site --> Edit --> Edit with Cornerstone). After the last action, the spinner remains spinning and I hence cannot enter Cornerstone. I recently updates WP and Cornerstone.
I have de-activated W3 Total Cache plugin and emptied all cache. I use Firefox 57, which is a key update of the previous version.

What hapenned?

Hi there,

Would you mind going over this article with some suggestions on how to troubleshoot issues:

In case the issue persists, kindly let us know.

Thank you, the W3 cache plugin caused the issue. Ticket can be closed

You’re welcome.

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