Paging problem - only get 1st result

[nanl]

This is probably quite simple, but I can't seem to conquer it.  I have a report which pulls data for a number of students.  I then want a report page per row/student, but all I'm getting is the first student.

Another symptom is that I can't select a field and get sorting/grouping options to be available.  My raw data is being pulled correctly - I'm running in version 8.4 and have run the View Tabular Data to confirm that.

For example - if the data is
Stu1>Course>Grade
Stu2>Course>Grade
Stu3>Course>Grade
My report page is only produced for Stu1.