Using the "new quizzes" I often find that they disappear and can't be given to students. When I try to add them to the module, they aren't there. Yes, I've tried looking under both "quiz" and "assignment" but sometimes they don't show up no matter what. I just spent 30 minutes writing a quiz and it's now useless. It still shows up when I click on the "quiz" tab on the left side of my screen, but when I go to add it to the module it's not there. 

This has happened before. Sometimes if I go back and try to add it to the module the next day it suddenly appears. Sometimes not and I give up. Help!