Seen a little stuff about V-Vocal weirdness on X1. Thought I'd relate my own experiences in case it helps anybody.
I had frozen some vocal tracks I'd tidied up with V-Vocal. Then I unfroze them to play with them some more. Fresh V-Vocal editing seemed fine but when I went to mix I noticed I wasn't hearing previous V-Vocal. (Luckily I'd done something pretty audibal and used V-Vocal to create a harmony).
Opening V-Vocal I could see the edits just fine but even soloing I couldn't hear them, I was just hearing the orig.
Tried muting and unmuting orig and V-Vocal clicks in the expanded track view. No effect.
Finally reopened each clip and clicked and un-clicked the Bypass button in V-Vocal and started hearing the V-Vocal processing again. No indication in the UI but I started hearing the harmony.
Enjoy!
CAF