In order to share the workload, we have several teachers who have access to any particular master course. We have had issues where more that one person is trying to edit an activity at the same time. The result is that they unknowingly save over each other's work. It would be great if you could make a popup or some obvious notification when multiple persons are working on the same activity. A message saying something like this would be great: "[[Warning], someone else is currently editing this activity. Are you sure you wish to proceed to the editor? Your changes may not be saved."