After editing a short video, I rendered it, and it only took about two seconds. (I thought something was wrong.) The file rendered was a black screen about six seconds in length. I tried again, making sure to save the Vegas file before attempting to render it again, with the same results. I found a work-around by pure chance; I opened the Vegas file through my file explorer, which opened in a separate Vegas window. I was then able to render the video as normal, which took about 5 minutes, and rendered the video I had edited. Now, this same thing has happened for a second time. I used the same work-around. I wonder if anyone has any idea why this might be happening. (I thought it might have happened because I might have forgotten to save the project before rendering, but that was not the case, as I saved before retrying with the first video, and also saved today before it happend again. Thanks for reading.