I loaded Vegas Pro 18 (trial version) and imported an MPG file. Everything seemed to play nicely. I shut it down to go do something else. When I opened Vegas Pro 18 again and loaded the same MPG file, it has gone totally silent. I can't find any icons or tool images that will make the sound play again. I even uninstalled and re-installed the software, but the quiet continues. Does anyone have anything that might help?