no audio on timeline

I have been having the same issue. However, it is only on certain layered slides. But I found a resolution!

The issue arises if I set a slide with layers to automatically play one of those layers when the user goes to that slide. The slide will preview perfectly, and the audio on the other layers will play in the audio editor, but will not play when I play the other layers in their timelines. The first layer displays, but its audio does not play. I can only think that the first layer interferes with the other layers' ability to display images or play audio.

Here is the remedy. On a layer that will not play, right click on that layer in the Slide Layer area. Click Properties. Select "Pause timeline of base layer" Click OK. The audio will play in the other timelines.

Just be sure to go back and de-select the Pause checkbox.

Hope this helps!