Quizmaker 13 not working in HTML5

Hi all,

I've got a presentation built in Presenter 13 with the following features:
- Menu is locked down
- Presentation contains inline questions dotted throughout (Quizmaker)
- Presentation has an assessment at the end (5 questions, also Quizmaker)
- Course must be run in HTML5

The problem I'm having is that if I exit the presentation (seems to be if I exit on a Quizmaker screen) and then relaunch it and answer "yes" to continuing from where I left off, the next Quizmaker screen I arrive at is already marked "incorrect" and I cannot answer it or progress past it.

This is an absolute showstopper for me and I cannot find any answers online. The only solution that seems to work is to unlock the menu, and this is not an option for this presentation.

Thanks,
Seán