A parent has 3 students in the school and wants to be able to view all of her children's calendar events at one time. If each student has 6-7 teachers, that could be up to 18-21 courses she wants all on her parent calendar. She stated that at some point when she starts to click the boxes on the right (next to the calendar), some of them begin to un-check themselves and the events for the unchecked course goes off the calendar. Is there a maximum number of courses that can be viewed at the same time on the calendar? Has anyone experienced this issue?