Same problem here. Windows 10 Google chrome Quiz doesn't work. Also in Internet Explorer you can't login in.
I have the same problem too. I get an error in the Chrome's console when I click an option.
Same, neither Firefox (60.9) neither Chromium works. Both running on Debian 10.
The Quiz is working for me, however 2 of the questions are wrong, there is no right answer
Ah, I just saw this message. There was a bug with the quizz system but it should be fixed now. Sorry for that!