Manually entering grades in the gradebook posts a form with twice the number of grade cells (one for old grade... hidden and one for the updated grade) and, if quick feedback is on, twice that many again (two for each feedback). So, wide and long gradebooks quickly get unmanageable. Post limits should be set accordingly:
- if using quick feedback, 4 * number of students * number of grades
- if not using quick feedback, 2 * number of students * number of grades
This would expose why 2,000 wasn't high enuff to cover your example mentioned above.