Hello!
When i was creating Lesson in Moodle 2.1, then i have faced a problem. The problem was when i was creating the content page, then at the end of creation page there was a tab "add question page". I was confused whether this tab is used to create a question page inside the content page or it is used instead of "add content page". Then i found that it was a bug "add question page" tab was wrongly used instead of "add content page".