I had this issue before with the viewer. I'm pretty sure it had something to do with one of my sound files. I'm really not sure why, but I had an OGG playing that was rather large, and the game would just go black when I tried to test it through the viewer, even though it worked on the browser.
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I had this issue before with the viewer. I'm pretty sure it had something to do with one of my sound files. I'm really not sure why, but I had an OGG playing that was rather large, and the game would just go black when I tried to test it through the viewer, even though it worked on the browser.
deleting that sound file fixed it for me.
hope that helps.