I think they should be able to do the homework. Some people haven't got enough time to finish all 9 courses, which means they can't start that course in second year either. You have to finish the earlier course to get to the next course.

What I do think, is that people can only grade the course they are taking in that year.

So let's say a second year student takes both DADA course 2 and Flying course 1, they should be able to grade only DADA 2 and Flying 1.

I've checked it again. Still no unread owl, still the 1 near my envelope.

I've got this problem too. Not always, but when I restart my computer or my internet.

Have to log on again too, even though I checked the stay logged on button.