Claire, you fellow technophobe! So nice to hear I am not the only one!
In the matter of quizzes--and I still have so many problems--I find it best and safest to get the entire quiz constructed and edited to the best of my ability and then PREVIEW the quiz staying in instructor/administrator mode. You can sort most problems out this way. Changing your ID to student is also a good idea, but most of the time I try to stay out of the quiz and just "look" when I am in student mode.
Now back to my own quiz problems! ;-(
Ellen