Cannot play audio when previewing a layer in design mode, unless choose to show the base layer
I am trying to build a slide with multiple layers. I have already done this successfully in the story that I am currently working on. Now, my latest slide, has an additional layer and I want to marry up the objects appearing and disappearing, to the audio. I don't want to see the base layer while I am doing this, so I opened the properties of the current layer (called Proxy Server)and selected the "hide base layer objects" check box. Now, when I click the Play button in design mode. The slide "plays" objects flit on and off, but the audio does not play. Can someone please tell me how to fix this? I have spent way too many hours building the layers to start over. Another oddity is that I cannot "deselect" the base layer check box, which I can do on the functioning slide that also has layers.