I've often had trouble with the nesting function in VEGAS causing crashes. Usually I'm not able to find the root cause and have to find workarounds to get by, but in this case it was very obvious. Nesting any audio event at all causes an immediate crash. I've tested this on several audio files (all downloaded from VEGAS Content), and it's the same every time. I can't tell if it's been like this before, but it has certainly given me a hard time. See the video below. 100% replicable on my end. I'm guessing it's somehow related to the same issues @X-Jake is facing in this thread.