hey everybody, I see this problem was described two years ago, but for those who still struggle with this problem and are looking for a solution please follow my tip. (at least it worked for me). Open Vegas and the project which stucks at 0% when rendering. Now, AGAIN open Vegas (so you will have two programs running at the same time). From the first Vegas, select all the files from your project and copy them. Go to second running Vegas and paste the all the files. Try rendering now. Good luck everyone!