I started a chat and dialogue with my students last week and added and attendance, unfortunately I messed up and tried to delete the attendance, for some reason it would not delete. I decided to restore the course from before I inserted attendance, initially I restored to a new course to check it was ok, what I didn't do was go into every resource and activity, it looked ok. I restored to overwrite the original course and then checked and found I had lost all the chat session and the dialogues, fortunately it was only week one, so not much lost. I have tried this restore function in both 1.4.1 and 1.4.2nearly. I restores the dialogue with the students but not what the students have talked about. Any ideas?