I'm using Vegas Pro 14 on my Windows 10 PC. I have made about five successful videos before this one. I have never had this problem before. It is a one hour project composed mainly of jpegs with a few video clips. It was working normally, but at some point as I kept adding more pictures and videos, the playback feature would not display the imagery, only play the audio. Did I put too many images or videos into the project? I cannot find a max size limit.