In the feature in subject you can see all your seen films or the ongoing ones that you are watching recently. From time to time you loose all the films in the "History" tab although you go to the "all" tab and go to a certain film that keeps the bookmark however disappear in the history. I don't know if this is a bug or a limitation of the history feature. Anyway it would be a good feature if all the ongoing films - not still totally "watched" - could be kept in the history until are seen.