[xwiki-users] CKEditor

Hi All, On an infrequently maintained xwiki instance (.deb on Ubuntu), which was running 8.4.1, the default editor is WYSIWYG In Administration | Edit Mode Settings | DEFAULT EDITOR, the dropdown box contains Wysiwyg and Text, and does NOT contain CKEditor If a page in the wiki is selected, the edit icon has the options in the dropdown for WYSIWYG, CKEditor, Wiki & Inline form, then below it, Objects and Class. If CKEditor is selected, the edit window is not shown. I tried an update to 8.4.4, and there is no change in Administration | Edit Mode Settings | DEFAULT EDITOR, but when a page is edited, it now shows in the place where I would expect to see the edit window the below Content #ckeditor($parameters) I'm lost as to where to look next, and would welcome some guidance. Cheers Arne