We are trying to figure out if this is a district issue or if others are having similar issues. Also, if you have any suggestions on how to help trouble shoot I would appreciate them.
I have escalated this to the Code.org team. A couple of suggestions: Can you report this as a bug so the Code.org team can check into this? It maybe helpful to post the students' code so the team can look for possible problems.
I have had this happen with one student, also a very strong programmer. They sprites were basic shapes, not overly complicated, but they all disappeared from the animation tab
Sorry to hear - please submit a Bug Ticket so that the Code.org team can look into this.