I have been using VP17 for a while, but it kept freezing my computer during rendering this particular project. (a MP4 that would freeze about halfway through a one hour render). I installed VP18 and it said it would take 6 hours instead of 1 hour, but once the timer reached zero it was only 67% of the way through. Not only that it put my computer to sleep (which is set NOT to go to sleep).

Any ideas?

There is plenty of room on the hard drive. The file destination size is a little under 10gb. There shouldn't be any issues with that stuff.