We have also had this issue, marks were there this morning but when attendance officer came to edit marks before dinner they had gone.
A couple of strange things we cannot get it to populate the edit marks section of SIMS and morning registration class are not appearing but academic class are.
I have since discovered that the exams officer did roll over to the new academic year and then back again? Could this have been a factor
I have spoken to our local LEA support team and they are investigating.
Anyone any ideas!!!!!
Resolved this issue, some one had ticked the two boxes in module setup in Attendance setup setting the date range outside of this year. This made the edit marks and morning registration class in lesson monitor disappear.