Hi There,
Thank you for writing in, I just updated my dev site to WP 5.0.1, but I did not encountered the issue that you describe its fine on my end, I can still edit my pages in Cornerstone.
Please check for the following:
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Ensure that you are fully up to date. WordPress, Theme, and Cornerstone (Version Compatibility)
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Clear all the site caches (plugin, server-side, CDN, and browser’s cache) so that the code from the latest release is always in use. This will help you to avoid any potential errors. Please deactivate this caching features while we tackle this issue. (please do this as more likely your issue is related to caching)
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Test for a plugin conflict. You can do this by deactivating all third party plugins, and seeing 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.
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Remove custom Javascript and custom templates (if any).
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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.
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Contact your hosting provider to increase your allocated memory limit or do it yourself by adding this code in your wp-config.php file.
define( 'WP_MEMORY_LIMIT', '512M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
You can add it before the line:
/* That’s all, stop editing! Happy blogging. */
Increasing PHP Memory Limit
If the issue persists, please provide us the site URL and credentials in a Secure Note so we can take a closer look.
Let us know how it goes,
Cheers!