All of the quizzes are now locked. It is understandable as it is overdue. However, I have reset the dateline but still the quizzes are locked. Can anyone help me dealing with this situation? Thank you… 
Hi Setia! This looks to be an account related issue. Please contact Coursera using this form so the agents can check your account. They should be able to help you unlock the content once they verify that your subscription is still active. Thank you!