Problem solved. I read your suggestion about download at: https://sourceforge.net/projects/mpcbe/files/latest/download. The new player plays it well. thank you.
When I play the project in the Sequence Preview it is perfect, video and audio. After sending to & creating Export Video, the audio is fine, but the the video is a Black Screen. My source files are AVI. I also do not know what frame rate I should be at.
Sam D