We have just made a change to the way due dates work for tasks assigned to a milestone. Now, if you create a task and assign it to a milestone but you do not explicitly set a due date for it, the task will automatically default to the due date of the assigned milestone. Additionally, if you later change the due date of the milestone, all associated tasks that does not have a due date explicitly set will also be updated with the new due dates. We think this is a sensible default and it should make it easier to make changes to the project. We hope you like the change.