Initially completion tracking and conditional activities are activated on the system. I created the following course structure: (1)Resource Page ( conditional activity: student has to visit/view this page to complete it) ; (2) Quiz (restrcit access: (1) must be marked as completed; condition: student has to get a grade) ; (3) Resource Page / Embedded a video file (restrict access: (2) must be marked as completed; condition: student has to visit/view this page to complete it) ; (4) Quiz (restrcit access: (3) must be marked as completed; condition: student has to get a grade)Quiz; (5) Questionnaire (restrict access: (4) must be marked as completed).
Completion tracking is set to: Enabled, controled via completion and activity settings
Completion setting begin on enrolment: set

If i log in as a student, and visit the first page, the navigation block is not updated immediately, so i can't navigate to the next activity. i have to return to the course overview (here i use topic format, so i've got to go to the topic outline) or hit the page refresh button (f5). there i see (2) is now activated. This issue fit to all page resources. the navigation block is never updated immediately when the condition is set, that a student have to view this page, to get the activity completed.

May be it could be the same issue as in : http://tracker.moodle.org/browse/MDL-17915