Have been working on a timetable in Nova T6 for a few days. It was saving everything fine since. But when I now open it, the timetable is gone, it's all blank. I can see some data like staff lists, but no table. I've even tried opening the backup files it automatically creates every half hour and they're also all blank. I've tried another computer too. What could it be?! I think it's lost everything I've worked on!