I'm not much of a coder at all so I'm not sure that this is a terribly important error, but when I closed the application it logged this:

File "Lesson.pyc", line 158, in acceptLessons TypeError: argument 1 of QMessageBox.information() has an invalid type

Just thought I'd put it out there for you.

Thanks. You're right, it's not something to worry about. It was supposed to show a message box with an error when you pressed the button to save/accept the lessons and you didn't have any text in the "lesson textbox", but it failed at doing that. Fixed it.