I had the same thing happen to a teacher. She had an assignment under one course shell assigned to only one class and not the other. When she left the filter on her gradebook for the class that was NOT given the assignment and went back to the assignment (by toggling back to the assignment in the gradebook AND also launching it through the module), the assignment would only show the Test Student.
When we removed the filter from the gradebook, then the assignment populated for the class that was given the assignment.
We have not had this problem before, but we suspect it was because both classes have been given the same assignment, so when a filter in the gradebook gets left on, it never affected anything. Somehow, since both classes did not get the assignment, the filter affects the viewing of the Speedgrader. Perhaps it is a safety precaution to prevent teachers from entering grades for a class that was not givent the assignment.
In short, remove all filters from the gradebook if the students are not populating in Speedgrader, especially for an assignment that was made for one class and not the other lumped under one Canvas shell.
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