I am also having this issue. Is there a fix? After two incorrect answers, the assessment freezes up. v188.8.131.529
This thread is from 2008. I wans even on the forums at that moment. Please start a new thread. If there would have been any answer, it would probably not have had any meaning for your in the present version. Mention also the exact version number you are using, and the OS.
And while you are doing that, please check whether there have been any default text captions removed from those quiz questions. For example, all quiz questions should have a Question Text object that contains the question, and another Question Type object that states what type of question it is (e.g. True/False), Multiple Choice. Are all of those present on all quiz questions in your quiz?