I've looked through the FAQ and previoius posts and didn't see this problem. If I missed it I apologize.
My source file is an mpeg video clip. I just wanted to trim it. After trimming and playing back I can't get it to render (Make Movie) in mpeg1 format. It acts like it has successfully rendered but when I play it back it only shows a still of the first frame and the sound plays fine. If I render it in avi format it renders and plays perfectly. However, I don't want an avi file because it is too large. All this, after I just upgraded to the latest files from the sonicfoundry Web site. Any suggestions?