Sony Vegas 8 Audio won't play?

I rendered my video in Sony vegas but some scenes will only play audio?

• After rendering my video in sony vegas, to youtube requirements, I found that some scenes only play the audio and don't play the video. I have no idea why. Only two scenes are like this, but I followed the same procedure to render all the clips. I was sure to uncheck the maintain aspect ratio box for every clip and I went back to make sure that they were all unchecked and they were. Should I try re-rendering the video? Or do you think I that I did something wrong? Any suggestions????

• Answer:

  The only think I can think of is that your computer may not be fast enough to render properly during the process. I would try using a different computer and see if does the same thing. Or just try to shorten the project and see if those particular scenes still gets no audio. If so- then there might be something wrong with the video itself or the downloading process. Why don't you try to download the program again and start from scratch? I hope that helps. =)