Hello,
you have done the right thing to extend the subscription.
please make sure your theme and plugins are updated to its latest version which is 3.9.2.
i want to know something:
1) you're the admin and also the instructor of the course in which issue is occurring??
2) if you are an instructor, have you made any changes in the course settings or in content??
3) after making changes have you clicked this button to publish your course. refer:
http://prntscr.com/nq6jbu
share your wp-admin url and credentials in a private reply. i will check this.