I'm trying to render to Sony AVC (mp4, m2ts, avc), Blu-ray 1920 x 1080 60i, 16 Mbps, Vegas immediately shuts down. I also tried the lower bitrate of 10 Mbps, same result.

Go Render as,
Sony AVC,
Blu Ray 1920x1080 etc
Custom,
System,
change it from AVC to M2TS and you're all good.
I think its a glitch, I tried a lot of ways to do MP4 Bluray and couldnt get it done.
Maybe someone else has a fix though.
good luck.