Practice Tests not working on multiple browsers & devices

Hi, none of the practice quizzes are working for me where they have worked fine in the past using the same set-up.

I have tried Chrome, Firefox, Edge, IE all on windows 10. Have upgraded Adobe flash but still not working.

Have also tried from an android device with no joy.

Example links:

https://opentuition.com/acca/f7/f7-chapter-7-questions/
https://opentuition.com/acca/f7/f7-chapter-10-questions/
https://opentuition.com/acca/f7/f7-chapter-18-questions/

https://opentuition.com/acca/f1/f1-chapter-1-questions/
https://opentuition.com/acca/f1/f1-chapter-11-questions/