In a quiz with random questions, the Teacher is not able to make comment or override grade, in the manner similar to the non-random questions.
1. Only X/ appears in the pop-up window (instead of X/Y)
2. The saved comment or the new value of X given above does not appear below the questions (in the review of attempt page)
3. The total grades for the quiz however gets correctly modified with the new value of X
4. The history of responses is not seen.

A similar issue appeared in MDL-5192 and MDL-7698. Solutions for this were suggested in the tracker but never implemented in bug fixes of later versions. MDL-5192 is considered "fixed", but does not appear in the list of bug-fixes of later versions. MDL-7698 posts some work arounds, but with the suggestions, the responses in the history of responses appears in a format: "randomxx-yy", where xx is the question id and yy is the response.