I have been getting a error occasionally when trying to report the operations, "specified argument out of range…).
When I look at the job it is late. If I remove it from the schedule, and then report the quantity… it reports fine.
Usually what I find has caused it is that someone has changed something within the job without removing the job from the schedule and re-scheduling it. There is normally something out of sync (change of resource, change of material, etc.).