We have found a glitch with the "Show one question at a time" option. If you select this option in a quiz with Numerical Answer, formula question or Fill in the blanks type of questions, answering with 0 will mark them unanswered in the sidebar.
When a student attempt to submit the quiz, an alert comes up saying "You have x unanswered questions" where x is the number of questions answered with 0 minus the last question (if answered with a 0).
Has anyone encountered this issue?
I have also attached a screenshot, where the professor has answered 1 for odd questions, and 0 for even questions in the Student View. Also, it has happened on Safari, Chrome and Firefox.