Quizzes in new and old courses stopped working - urgent

Hello,

This is something we need help with urgently as it affects many of our projects and our clients. Clients that needs to push students through courses before the students receive certain authorizations.

Our quizzes in several projects have suddenly stopped working - we get complaints that people can't answer enough questions to pass the quizzes and upon investigating we found that the questions are greyed out.

I have attached a Storyline file and a comprehensive walkthrough of the problem with me speaking and showing the Storyline file.

Is this some new or old feature that we need to be aware of to fix the problem or is it a bug? We have never encountered this before and can't seem to figure out why it would happen.

Please help as soon as possible, thank you.