Hi,
We just recently pilot tested our Moodle Quiz module and had ~50 students attempt the quiz. The quiz was composed of essay and T/F questions and quiz was only opened for a couple of hours.
Problem occurred upon reviewing the results, we saw that only one student(let's call him J) has a Time Completed stamp and the remaining students have their "Time Completed" fields blank and therefore having their Time completed set to open and Grade to 0. The quiz is now closed but good thing was their answers were saved. We clicked the regrade link to see if all students will have a grade but instead it removed the initial grade that student J received. We haven't graded the essay questions yet as we want to resolve this issue first.
The students all took the test at the same time by the way. And the result of this test will be considered in their curriculum so this is currently a big problem for us
We're using:
Moodle 1.8.2 (Quiz module version is 2007020200)
PHP 5.2.4
MySQL 4.1
IIS on Windows 2003 server