2.7 and master Install qtype_varnumericset. Create a question of that type, adding at least 6 answers to match Save the question, then try to edit it again. Or, just trust me that I have done those steps, and this is a correct fix. In master only Here it is a question how much you test now, and how much you assume will be caught by the Moodle 2.8 QA cycle if it is broken. A complete test would look like this. I suggest you pick an intelligent sample of this. Preview a quiz. Create then edit a category in the question bank. Create, then edit, then preview, questions of these types (most changed first) calculated calculatedmulti calculatedsimle multianswer numerical essay match shortanswer random short-answer match Import/export questions in these format (again, most necessary to test first.) Moodle XML GIFT webct Blackboard XHTML For most of those formats, there is a sample file inside the code, e.g. in question/format/blackboard_six/tests/fixtures