Sound Issues

I am having an issue with the sound on the website. I can hear songs that others have written in the Explore section, but when I want to work on a draft I've created, no sound. The same when I try to start a new song. It was working last night when I was originally creating my draft. I've left the site and come back with the same problem. Then it somehow started working again (though I don't know what I did to make that happen), and now the sound is gone again. I think I clicked on another tab in my browser (Safari on a Mac) and then came back to my song draft tab and the sound had stopped. The file plays, just no sound. The fact that I can hear other's compositions on this website, but not my own seems very strange. Any help would be greatly appreciated. Thank you.