I had no problems with it before.  Multiple tracks and clips, splitting etc etc.  I think I even used it in X1.  But I just tried to use it again after some time and it won't load the interface without crashing.

Having same problem running Window 7 64 bit with Sonar X1 - crashes everytime!

Just tried 32 bit and works fine.

I have found that freezing all my soft synths allows me to use V-Vocal but having soft synths unfrozen and large RAM usage causes a crash as soon as V-Vocal is invoked.
I reported this on CWBRN-3942 and would hope anyone else would too. The more dissenting voices there are the higher up the priority list it will go.

At the time I thought it was specific to when I had ReFx Nexus in my project but now I am not so sure.
It only happens to me when the project uses large (>4GB) of RAM.

I find it crashes when mem is used up, my biggest issue is I can go for days using V-Vocal without any issues, then all of a sudden the v-vocal section gets greyed out, no matter if I bounced to clip or not, the only way to restore was to reinstall X1

Works perfectly here under XP32, X1B build 255

not fixed? when i use v vocal in big projects, it always crashes.

Sonar X1d 64 bit

I've had good luck so far but I only do small clips at any one time.
Is it only with larger clips?

I'm not used to it crashing all the time. If my project doesn't have any synths, I don't see many crashes. But if I add a session drummer, a couple of dim pros and a zeta2... well then, I get some crashes. Some times, I find it works if I click the mouse tenderly. It requires a sensitive, loving touch.

Win 8 x64

So . . . are we saying V-Vocal crashes are related to X1 Win 64 bit systems ?

I've just finished a long session editing Vocals and BG Vocals in V-Vocal on my X1 Win 32 bit system, and had no troubles with crashing, but I do make the clips I'm editing fairly short. (Verse, Chorus, Bridge etc . . )
I use V-Vocal all the time, never crashes.
Are the crashes happening specifically on longer clips, say 3 minutes plus ?