My students are in CSD unit 2. I have a student who by my view of his progress, has completed lessons 1-9. Last week, when he looked at his progress, all of the bubbles were white. I could still see his progress and the feedback I gave him. He can’t see the feedback. This happened to another student but only for one day then she was fine. I discovered this problem with a third student today.
Any thoughts on cause or how to proceed?