Changes [Nov 17, 2017]Adding Assignments ...
This is a known issue, but I don't know for sure why it happens. It does seem more prevelent with students who have left and come back to school.
Power School Suggests this work around.
In the Gradebook,
Click the down arrow for Active Students (Left Panel) The Click on the first student on the list then hold the shift key down and click on the last student in the list
All Students should now be highlighted.
Click on the Report tab
Click on Final Grade and Comment Verification report
Click on selected students
Select the correct term (May have to scroll down)
The click Run report
The list should now have everyone on it.