We've found the problem. The problem is not in VideoPad. It's a shared component that we updated few days ago. It happens to users installed VideoPad in these few days. We've already fixed the component on the server. To fix this please delete the malfunctioning component from your local disk. VideoPad will download it again from the server when you export. The component can be in one of these file path:  C:\Users\[User Name]\AppData\Roaming\NCH Software\Components\aacenc3\aacenc