I use Hitfilm 2 Ultimate. I render composite shots into MP4 video and then edit them together with sound and music in Sony Vegas 11 Home Studio because I find that more efficient. However I've found that when I try to render the Sony Vegas project into one big video, it crashes in the middle of it. This problem happens most often with projects that have a lot of shots that I put together in hitfilm. Any ideas as to what might be causing this?