Known Gradebook2 Issues
1. TA grading permission does not work when the site contains a single group.
Issue: When an instructor creates a single group on a course site, and grants a TA permission to grade “all sections”, only the accounts of the members of the single group will appear in the grade book spreadsheet.
Workaround: Create a second group that includes all of the students and student non-registered accounts. Affirm that the TA has permission to grade “all sections” (Gradebook2 / Edit / Grader Permissions Settings). This will display the accounts of the entire class on the Gradebook spreadsheet.