In 1.9 the quizzes that we created all had the "Build on previous attempt" feature enabled. Instead of seeing the entire quiz again, MOODLE would be able to pull just the questions that were missed. For example, on a 5-question quiz, I missed questions 1 and 3 on the first attempt, and then on the second attempt I only see questions 1 and 3 and nothing else. Using Moodle 2.2+ this does not seem to work when the quiz is set to deferred feedback or adaptive mode - as whenever a student reattempts the quiz they are presented with the entire quiz all over again and no indication of that was or was not correct in the saved attempt. This creates total confusion on a 40 question quiz.
To recreate the problem
1. Create a quiz that has the following settings:
Unlimited attempts, Deferred feedback (or Adaptive Mode), Question order as shown on the edit screen, Shuffle No
2. Attempt the quiz deliberately getting some answers right and others wrong.
3. View the feedback (you will see answers right and wrong listed)
4. Re-attempt the quiz
5. All questions will be presented with no indication as to the previous results.