Its funny that you suggested the guy go buy the “new and improved” vegas pro 12. Funny because i bought pro 12 about a week ago as a first time user of vegas and have already experienced the same exact stupid problem the original poster is. I rendered around 350 png stills in Blender so that i could have the alpha channel when editing in Vegas. Opened them fine, editted them into a short movie fine,….. go to render as a .mov and Vegas crashes around 70% every time for the 11 second video. Noticed it WILL render shorter videos into a .mov file (like in 4 second increments). So i split up the 11 second video as three different short clips to render. Worked. Go to combine and render them into 1 .mov file, and again Vegas crashes like 3/4 the way through. So…. Long story short. Paying $400 for Vegas Pro 12 dosnt fix the problem…… lol. Any real suggestions for fixing the problem other than say “wait til pro 13”?