using Moodle 2.0.3 (Build: 20110505)
Create a lesson with n pages (MCQ questions).
Student starts lesson, answers qestions up to and including e.g. page 4 then quits the moodle course.
Later, student logs in to the course and goes to the lesson. Notice is displayed:

_You have seen more than one page of this lesson already.
Do you want to start at the last page you saw_

Student clicks "yes" and ... is taken to page 2.
Bug: student is always taken to page 2, irrespective of the last page he visited!
Plus: however, the progress bar "correctly" displays the percentage of pages previously visited!