Hello. My students just finished some of the lessons. When I try to go in and "tinker" each design, I get the following error message: "410 - The requested page has expired."
It's been less than a week they finished the lessons. I was able to access them up until this Tuesday (02/12). I cannot rely on the preview image as it is not always correct or updated, and I need to give them a grade for their work so now I am stuck...