I'm using Vegas Pro 16 Build 424 on a Windows 10 machine.
More often than not -- about 75% of the time -- when I exit from Vegas Pro (via File/Exit), it leaves a background process running, causing other programs to crash. This affects especially DVD Architect and Adobe Photoshop. I've gotten used to going into Task Manager every time I exit Vegas, to do an "end task" to kill the Vegas background process. But it would be much nicer if Vegas didn't leave the background process running when it exits.