Under the old (current) version of the course, there is a control that allows me to turn off audio exercises for a period of time. This control is missing from the beta of the new web version. I have occasions when I want to work on a lesson but do not have the ability to do an audio exercise. The drill on which I am working does not allow me to skip the item in question without marking it ‘wrong’.
I am using Microsoft Edge on an iMac Pro (2017). There is nothing for me to reproduce as far as an error goes.