@fr0sty Great suggestion (Otter Scripts) but I tried this a few months back and it looked promising, but same issue sadly enough. I think it's the compositing engine that crashes and Vegas never recovers. That's probably also why the issues happens in 4K60 but not in 1080p for instance with the same project. I believe there are serious issues with the compositing engine running in 4K.@Zkuggi I have experimented A LOT with the buffer memory at 0 or a different value. I have 64GB of memory and whatever I set, Vegas doesn't ever use more than 14GB max, I do see Windows using more but often that doesn't go above 24GB in total while rendering.The 0 setting does fix some rendering issues but it also makes rendering so slow it's not usable for large projects. With or without cache can sometimes mean a 5x in render time (at least in my tests).
So that's the problem I'm dealing with, I made that mistake a few times too, I know there are others. There are so many problems with the software that I don't want to give up on it, it's a great tool but it's a bit broken. I know what I need to do to fix it. That's a big part why I also don't like to recommend it in this case. Perhaps the reason you didn't encounter the same issue is because it is still in beta or the reason why it happens to me is because I have a very powerful PC, a top of the line videocard and a good amount of memory. When you pick up a cheap PC, then you might be lucky and it will work out-of-the-box or it will work after the first time you try it. If it doesn't you might have a problem with your config. I had and still have that problem on my old PC with an EVGA Geforce 9800 GT and I know it didn't work on my new one.I know you also have the same issue, only mine is still here, it's never been solved. I did dig around it a bit and it seems like none of the other people that encounter this type of problem were even able to get it to work, except for the hack that was found by Zkuggi. I asked around a lot in the past for some suggestions and that link was the only one that helped, however I know it doesn't fix your issue. I always tried that, restarting Vegas, closing it, opening it again, opening it from the start, cleaning the caches and restarting Windows, nothing was ever able to fix it for me. I've tried various other things, like deleting all the temp files and even reinstalling Vegas, but nothing worked. 827ec27edc