I don't know if my issue is related to
In top debug mode (developper) mo error messages are displayed at all.
I'm using Moodle 2.3.2+ (Build: 20120927)
I can reproduce this issue in Firefox, Chrome and IE. @moodlerific also reported me by twitter the same issue
FULL STEPS to reporduce this issue:
a.- Setup a Moodle Quiz
c.- Save the quiz
d.- As a student try to open the quiz --> The quiz doesn't open