to avoid CRASH/NOT RESPONDING when rendering in sony vegas pro follow this.~
1.) on the menu tab click on "Options" - "Preferences" - "Video" tab
2.) look for the "GPU acceleration of video processing:" and set it to "OFF"
3.) click "apply" then "OK" save your edited project and exit Sony Vegas Pro.
4.) open your saved file again then click on "render" select "MainConceptAVC/AAC(*.mp4;*.avc) Internet HD.
5.) click on the"Customize Template" tab and make sure to set your "Encode Mode:"
to "Render using CPU only" then click ok and proceed to rendering.