Ok, the project is 1440×1080, 25i, 5.1 surround sound, 18Mbits streams. This is how it comes from the camera (avchd format) so I made the project exactly the same.
Don’t you mean 50i?
Screenshots from MediaInfo for your media file, your Vegas project settings and Vegas render settings would be useful. A screenshot of your timeline at the place where it stops might also provide some clues.
Have you tried rendering just the audio? You can render just your 5.1 ac3 track. It should render pretty quickly and if successful, it would at least rule out a problem with your audio.
If all else fails, you could set up a number of loop regions and just render out shorter segments and later combine them into your final file. In all honesty, I don’t think I’d ever attempt to render a six and a half hour program in just one pass, but rather break it down in manageable segments and simply combine the rendered files afterward. Just a thought.
wwaag