Doug - Can you take another look at the [coursename]_set_user table in the database. You wrote:
The one difference I noticed with the student in question was the 'lis_source_did' column of the [coursename]_set_user table was NULL. For the other students, it was populated with a long hexadecimal-looking string.
- Does this student have non-NULL values for 'lis_source_did' for other assignments?
- Are there any other NULL values for 'lis_source_did' in the table and if so is there any noticeable pattern?
Could you also confirm that this student was able to do prior assignments when the LTI grade passback was enabled.
Thanks,
Nathan