I am intermittently experiencing a button issue in my published course. For example when using Internet Explorer 11, a single click on the 'Submit' button for a quiz question does not work. It has to be double-clicked. When a single click occurs, the highlight appears around the button and when I double-click, the action of submitting/checking the response is performed. I am required to make my courses ADA compliant and have the 'Enable Accessibility' checked in the 'Publish Settings'. Has this occurred for anyone else? Is there a known workaround so that the user is only required to do a single click?