I recently installed the Marking block and since then Moodle has been losing submitted assignments, setting grades to 0/100 and deleting the comments. This affected one group in one course for one assignment, then it affected all users within that one assignment and now it is spreading to other submissions.

Please help since this is almost 300 pieces of work!

If I go to view the assignments directly by group then some of the missing ones in the global (Grades) view appear; which implies the data is still there. But in other cases everything is missing.