Checked my test Moodle 2.6.6 site - confirmed. Participants list displays
This page is: General type: incourse. Context Course: 0019 SCORM tests 2015-02-05 (context id 8826). Page type course-view-topics
BUT the real main course page says
In my example (Moodle 2.6.6) the course page says:
This page is: General type: course. Context Course: 0019 SCORM tests 2015-02-05 (context id 8826). Page type course-view-topics.
so the General type is "course" not "incourse"