Cornerstone + Revolution Slider updates have broken layout on our staging site. We have the Classic Editor installed and have not updated to Gutenberg yet.
Hello @M72561,
Thanks for writing in! I have logged in and investigated your issue. It seems that there is a problem with your server. Both the WordPress admin dashboard and the front end of your site is having Error 400 and Error 403. Please contact your hosting providing and ask for further assistance in resolving these server errors.
This links might help you:
Thanks, this is now resolved. The permission setting needed adjustment.
You’re most welcome! And glad it works 
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