V-Vocal has been prone to crashes on many systems since it was introduced. Cake claimed to have made stability improvements in previous patches, but it has always remained unstable with my sytems (2).
Other have mentioned, if you can get it to work, immediately bounce down when you finish the edit. Then save! Then continue. I realize sometimes it will crash upon opening, in those cases, I have taken the offending track, inserted it in a new project and fixed it there.
The tech support suggestions were not successful for me, and many others. I assume they could never locate the instability problem that plagues many of us. Some people are able to use it without issues, some options are:
1 - Get new pitch correction software (Melodyne/Waves/Autotune etc)
2 - Hope to have better luck on your next DAW build
3) - Have your singers sing better, or leave the slight pitch inaccuracies in, or
4)- Give up on the T-Pain cover