"Edit this section" sometimes does't work
That's just a minor look and feel bug.
If there is a line with a space before a following header, "Edit this section" shortcut doesn't work for that header. Have a look: http://www.redmine.org/projects/redmine/wiki/Playground
#1 Updated by Stanislav German-Evtushenko about 6 years ago
404: The page you were trying to access doesn't exist or has been removed.