VIP Task Manager Professional doesn't show tasks with due dates on Calendar view.

VIP Task Manager Professional doesn't show tasks with due dates on Calendar view. Why?

Due date option and Start/Finish dates option are from different workflow types. Due date is rather for Task List view than for Calendar view because, actually, this kind of task can be done on any day before the due date. If you want a task to be displayed on Calendar view you can it is better to use Start and Finish Dates.