You may find that the volume controller is unresponsive when the following conditions are true:
- You've configured the player to fill the browser window.
- You're viewing the HTML5 version of your course.
This issue was corrected in Update 3 for Articulate Presenter. To take advantage of the new features and fixes, download and install the latest version from the link in your product confirmation email or get it here, then republish your project.