Can't continue my course

Yesterday I was in “A day at the supermarket” almost done with the entire course, and then the shortage came to codecademy. I tried to run the course last night, and it had skipped an entire chapter of the course? The “Student becomes the teacher” chapter was all done.
So I did the “Student becomes the teacher”, “Again” and I’m done. But now I can’t access the next chapter.
What is going on?? And what do I do here?