There is an option to include a comment box with a Matrix of Choices (MOC). When the results are exported the comments are not included in the export. This is important because this question type will often be used for a surveys in which exporting comments will be critical.
Steps to Reproduce:
1. Create assessment with a MOC survey question, mark option when adding the MOC for: "Add Comment Field"
2. Publish the assessment
3. Login as student and take the assessment and select a radio button for each row from the MOC and type a comment in the comment field.
4. As instructor, view the Scores screen for the published assessment and choose the student's name to view the results and notice the student's comment.
5. Click on the "tab" for Export and download the export of the results and notice that the file includes each of the answers from the matrix, but omits the students' comment from the exported file.