I've had this issue for while, but it seems to be getting worse. Occasionally, I'll drop a clip on the timeline, and it will play fine. Later, when I play back the project I'm working on, the clip won't play. All other clips on that track and on the timeline play just fine.

Even stranger, if I zoom the timeline out, I can see the clip's waveform. If I zoom in closer, the waveform disappears, making it look as though it's a totally silent clip.

Dragging the same clip from the explorer by onto the timeline produces another silent clip. If I create a copy of the file and drag that onto the timeline, it will work fine, though it may eventually fail.

This seems to happen most often with short clips with a solid peak--like doors opening or phones being picked up. Thus far, I've never had the issue with a longer clip or with audio attached to video.

Does anyone know why this might be happening, or something I might be able to do to fix it? I'm using Vegas Pro 12 on Windows 10. Any insight would be amazing.

Thanks so much!