I have a fresh installation of Moodle 2.8.1. I have added two courses. In both courses I have created the same number of sections (38). When using the 'current week first' structure, I'm able to see all the past weeks and the current week. However, when I enable editing, I only see the last section of the course. This is independent of the start date of the course.
When I change the course structure to 'current topic first' I am able to see all the sections when editing. If I return to the 'current week first' structure, all content is preserved and visible when not editing.
Am I doing something wrong? I would really love to see a solution for this, so I don't have to switch the structure to be able to edit the content of my sections. I really like this plugin for using Moodle to provide extra content belonging to a lecture.