One of campaigns I was running had disappeared from all my players' lists. After giving them back the join link, I noticed that the entire chatlog has disappeared, all pages, character sheets and music have disappeared as well as default settings regarding avatars and voice. I am using Firefox with the plugin Ghostery, on Windows 7 Home Premium x64, and the game was last played one week ago on 2/5/2016. Does anyone have an idea what may have happened?