The Quiz module enters into a looping when a timer reaches the 3 second mark. No matter what a student does, the screen keeps looping over and over. the only way to get out is to close the browser.
My setup is:
Moodle 1.6.2
MySQL 5.0.24
PHP 5.0.4
Windows Server 2003 w/ IIS 6
Browsers: IE 6, IE 7, FireFox 1.5+
O/S: Mac (OS X or later), Windows XP, Windows 2000