V-Vocal can still be a bit flakey at times.
Your best bet is to open a new (blank) project, drag/copy your track to the new project and do your V-Vocal work there. Bounce the clip to itself and drag back to the real project.
BUT......... you say you're using it for "quick volume fixes"
I would never use VV just for that - track automation is IMHO a lot quicker and indeed a lot more precise than fiddling around in the VV window.