wilhelm scream said:
I'm starting to be glad I never upgraded Vegas past movie studio HD Platinum 11.
There have been substantial upgrades since movie studio 11, especially when considering the move to Pro, so your point is rather silly.
In the last version or two, there have been some conflicts with hardware, but this is as much the fault with hardware/OS configurations as it is with Vegas.
To expand on Dig's questions, we need some more info. Do you have VST or external plugins installed? What plugins are you using in this particular project? When exactly does the crash occur, and can you provide screenshots of the crash message?
Screenshots of your Vegas Preferences (video tab), project settings, and render settings will all be informative for us to diagnose your problem.