Just to add to this discussion for others who have a similar problem but not finding a solution, I found two solutions. I once found that I solved this issue by taking out a certain piece of audio. It played fine after that, and then I reinserted the audio. Still great. A second time I was working on a project, and when I un-enabled a piece of audio, it suddenly wouldn’t play for me. After a while of playing around with the timeline, I re-enabled that audio, and it worked just like before. I’m sure this is a deeper issue but it might help someone out there.