There is a known issue where the self assessment exams in the downloadable section of the course do not display a result when completed. If you experience this issue, please goto https://www.whatismybrowser.com/ and send the link to firstname.lastname@example.org. This will help us to narrow down the root of the problem.
The course appears to be having no issues with Google Chrome which you can download here: https://www.google.co.uk/chrome/browser/desktop/. During installation make sure you uncheck the box that says "Make Google Chrome your default browser". Once downloaded and installed Right Click the MTCS HV Course file > Open with > Google Chrome.
Apologies for the inconvenience, we are working to a resolution to this issue. Please note the self assessment exams are not logged and are not reflected in your Final Exam score.