Looks like there's an issue when I get an Overdue task notification. Normally, if a task is overdue, I can click reschedule and set a new due date.
However, if the task has subtasks and I try to 'reschedule', I can set a new due date but the date change doesn't stick.
After a bit of testing and investigating, this seems to be due to the fact that CU is trying to ask me if I want to update the subtask due date as well. This shows up correctly in a task detail window, but doesn't work in the Notifications page.