After changing Display preference Wysiwig Editor setting from Text-Area to CKEditor
the editor not loaded anywhere.
Also the Configure CKEditor button is not visible in display preference page.
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In my instantion i see "configure ckeditor" button, but he disappear after few sec.
I use Drupal 7.61 and CiviCRM 5.8.1
In this gif i will reload settings page
I am also seeing this on CiviCRM 5.8.0 and CiviCRM 5.8.1 on Joomla (but I don't see the Configure CKEditor button at all unlike @marcineq however).
I did a brand new Joomla installation + CiviCRM 5.8.1 to test it. After installing CiviCRM from scratch, these are the steps I used to reproduce the problem:
Go to Administer > CiviMail > Message templates, Add New. CKEditor is working.
Go to Administer > Display Preferences, the out-of-the-box setting for Wysiwyg Editor will be "Textarea", even though CKEditor is working.
Change the value of Wysiwyg Editor to CKEditor and click Save
Go to Administer > CiviMail > Message templates, Add New. CKEditor is now not present; a text area will be present for HTML instead.
No difference if Wysiwyg Editor is changed back to Textarea.
I could reproduce the above steps on dmaster, although after I saved Display Preferences you won't get CKEditor back until dmaster is refreshed.
Before doing the above I dumped the values in the civicrm_setting table for comparison. It contained only the following initially:
INSERT INTO `civicrm_setting` VALUES (1,'resCacheCode','s:5:\"cwvVv\";',1,NULL,1,NULL,'2018-12-17 09:29:31',NULL),(2,'installed','i:1;',1,NULL,1,NULL,'2018-12-17 09:29:08',NULL),(3,'navigation','s:8:\"eJRrOipD\";',1,2,0,NULL,'2018-12-17 09:29:50',2),(4,'site_id','s:32:\"ad0b365819be56e7632257b473970958\";',1,NULL,1,NULL,'2018-12-17 09:29:50',2);
After saving Display Preferences, there are 14 more values in that table. The row 'editor_id' is the relevant one: