Actually, this is the same problem as in The xwiki edit page is blank - #18 by shiraz , the difference is that in 16.10.12 the realtime editor catches the problem and falls back on the standard editor, showing a notification message at the bottom of the page. So you still need to understand why the realtime configuration is missing from the page. The realtime configuration is injected through the org.xwiki.platform.template.header.after UI extension point, provided by global.vm. Have you customized this template?