kubegusa on "Visual editor gone missing"

I did a fresh WP install a few days ago. I only played around with themes and colors so far. Then I wanted to start adding content and noticed that the visual editor is GONE. On new posts as well as new pages.

I tried with other browsers (flushed cache etc)
logged in and out of WP several times
I added this code
define('CONCATENATE_SCRIPTS', false); to your wp-config.php file
I added the Use Google Library plugin
I renamded the plugin folder on ftp
I reinstalled WP from the dashboard
I added the Blackstudio tinyMCE plugin
Tried logged on with a new WP user
I even sent Reiki to it..but alas...

>> No change

I have another WP site that I didn't upgrade to the latest version yet, and no issue there - so I'm afraid to upgrade it for now.

What could I be missing?

First off, go to Users->Your Profile.
- Make sure that the box marked "Disable the visual editor when writing" at the top of the screen is not checked.
- If it is checked, then uncheck it and scroll down to the bottom of the page and click the "Update Profile" button to save your settings.

Forgot to mention that I did that already. Thanks though.

If that setting is correct:
- Your browser can help you identify JavaScript issues or conflicts. Do you have any Javascript errors in the console when looking at the editor page? - This article can assist you in doing that diagnosis.
- If you use any caching systems, like Cloudflare, clear those caches.
- Check that the file permissions of all the PHP files are set correct (i.e., 644).
- Specifically check files like /wp-includes/js/tinymce/wp-tinymce.php and such.
- If the permissions are incorrect, then some servers running security code like suhosin won't allow those files to run.