Sorry, it is not possible to say more without some for of debug output.
The fact it work in other courses shows that the code is not fundamentally broken. But there must be something about that particular quiz that is causing the problem, and you need to start isolating what that something might be.
Thanks, Tim
I can't see any debug info as the page freezes - I assume. I don't handle the technical side: If the debug info was sent to the log rather than the page, where should the tech staff look for it - is it obvious?
I've tried with a completely new quiz in this course with same result. I'm not sure why the Quiz module works fine in any other course but not at all in this...
Thanks
Alick
Where the PHP log file goes depends on how your system is set up, I am afraid. Anyway, sounds like you need to talk to your tech support.