(This question was asked in 2019, but the thread is now locked, and I am hoping there has been an update).
Our quizzes are set in sequential mode. Students click on the Next button and then claim that the system is skipping a question. Now, whether this is a glitch or finger trouble is something that we can argue, but the fact is it will start an avalanch of students skipping difficult questions and putting us in a tough spot.
So, is there any way that we can prevent the Next button from being visble or active until a choice hase been selected?