When I export the timeline to tape, the process starts normally and then after a short time, the exporting speeds up like it is being fastforwarded. The projects are anywhere from 6 minutes to 30 minutes in length. I've solved the current problem by deleting all the preview files and rendering again. But this doesn't always work. This is happening with Premiere 6.5 on a computer with a 60 GB hard drive and 25 GB free. Any ideas or solutions would be helpful for my students and myself.