This has been happening to me too! I have a 15 min holiday film using HD 1080p video files and it crashes at around 7% whether it be as a file or trying to burn to DVD. I think my PC may have something to do with as it was struggling when I was uploading the video files into the programme.
What is the recommended spec for a PC when working with VideoPad and HD footage? My PC is quite old, only 1GB RAM and a 3.06Ghz Celeron CPU. I have all the vid files kept on a 1TB external drive rather than on the PC though. But the programme still crashes.