Can’t Edit Post Status, Visibility, or Publish Date

Have you tried:
– Flushing any caching plugins you might be running, as well as server and/or browser caches. Not just your browser, but any op cache or content network cache as well such as Cloudflare. If your host provider has a “Purge Varnish” option or if you can ask your provider to flush memcache on your server. If you are using SiteLock, please follow these steps to manage your caching:

• Login to your SiteLock dashboard.
• Click “Settings” on the left of your screen.
• Near the middle of your screen click “TrueShield Settings” and select “Performance” from the menu that drops down.
• In the Performance section locate the large red button labeled “Purge Cache” to clear your site cache.

– deactivating ALL (yes all) plugins temporarily to see if this resolves the problem (plugin functions can interfere). If this works, re-activate them individually (one-by-one) to find the problematic plugin(s).
– switching to the unedited default Theme (Twenty Sixteen.) for a moment using the WP dashboard to rule out any theme-specific issue (theme functions can interfere like plugins).
– MANUALLY updating. Download a fresh copy of the WordPress .zip file to your computer, unzip it, and use that to copy up all files and folders EXCEPT the wp-config.php file and the /wp-content/ directory. You may need to delete the old wp-admin and wp-includes folders and files on your server before uploading the new ones. Please read the Manual Update directions first.
– Backup: If you haven’t already done, always backup everything (including your database) before doing any actions, just in case something really goes wrong. You can never have enough backups!