Cornerstone not working post theme and core update

[lovecoms]

Hi, i’ve just updated cornerstone, after theme and core update. Cornerstone now doesn’t launch - I start a new page and click edit with cornerstone, the ‘do you want to leave this site. changes you have made may not be saved’ screen launches, i click yes, then get a blank wp page again.
Please assist urgently
thanks

[paul.r]

Hi,

Thanks for writing in!

Please follow the steps below:

1. Ensure everything is up to date according to our version compatibility list here. Please follow the best practices when updating your theme and plugins. Click here for more information.

2. If you’re using a CDN, please clear the CDN’s cache and disable optimization services. For the CloudFlare you also need to follow the steps below besides the developer mode: https://xthemetips.com/using-cloudflare-rocket-loader-with-x-pro-and-x5/928/

3. Test for a plugin conflict. You can do this by deactivating all third-party plugins, and see if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.

4. Remove custom CSS and Javascript from the options or Child Theme and test the case.

5. Reset your htaccess file by renaming it to .htaccess-bak. Then in WP Admin Menu, go to Settings > Permalinks and just click the Save Changes button.

6. Increase the PHP Memory Limit of your server.

7. If you still have problems kindly get back to us with the result of the steps above and URL/User/Pass of your WordPress dashboard using the Secure Note functionality of the post to follow up the case.

Thank you.