I bought the simulator a few weeks ago, and it worked properly. I finally did the software update the launcher screen recommended, and now it works fine until I go to full screen mode, then the sound goes away. Even after I return the sound is gone till I close and reopen the program. The resolution is horrible on the windowed mode, so I would love to get this resolved, and I have contacted the "technical support" through the program, and all I got was response email saying they received my concern. I saw a thread on here that had no sound at all but that is not my issue since it does work when I first open the program.