n Moodle 1.9 instructors were able to view answers of an open attempt in Moodle. In 2+ this ability is missing. If you review an attempt that is open now you can see the student responses. You can only see the correct answers for Cloze questions. No other correct answers can be view.
It would be very helpful to be able to view answers for open attempts for all types of questions, especially calculated questions. For our courses, students have only a close time for the quiz, so no timelimit. They will often work on it for a few days and email questions to the instructors. Not knowing the answers makes it time consuming to give the student help.