Button cover will not change to hidden when returning to tab
I'd like our students to (1)see/hear the information on the slide tab. when the audio finishes, the video to the button will be enabled (2) click to watch the video. when the video completes, the back button will enable (3) return to the slide tab. The video button should be in it's visited state. A translucent box is covering the tab buttons. This should disappear when the video button is in the visited state.
It is the last part that is not working. Even though the video button is "visited" it will not follow the trigger to change the button cover (translucent box) to hidden. I don't know why this is happening.