Not sure where to start with this one, but sometimes (often times) when I am in the editor working, suddenly I will have entire tracks just go completely silent on playback. Wave form is still there, but when playing, it processes no sound. The sound mixer doesn't display anything happening. The only way I get around it is restarting the program. This happens multiple times an edit session and isn't brought on by any specific action. Sometimes as simple as zooming in or out on a timeline, or minimizing the program and then coming back to it, or just any other combo of actions I am not able to track.
Anyone have this experience? I experienced this with Vegas 19 as well as Vegas 21 which I just purchased yesterday.