I have used X2 for about a year, and I can't tell you how much I love this program.  There were a couple of weird glitches, like V-Vocal crashes, but I finally got used to saving before I used V-Vocal because of that.  I had hoped that they would stabilize it in X3 but I am sad to report that it is much worse.  I have tried everything, including converting all of my softsynth tracks to audio and gotten rid of any extra plug ins that I don't need, and even with 4 -5 tracks stripped down I have not even been able to use V-Vocal once w/o it crashing. :(
 
Anyone have any suggestions?  Not there yet, but I am starting to wish I'd not done the upgrade.... 
R

Have you updated to X3B?
Have you uninstalled X2? Keep in mind that VVocal is not included in X3 so you must leave it installed if you remove X2.
 
Is VVocal crashing immediately when you create a region FX. If so it sounds like something has broken the VVocal installation and you will need to reinstall VVocal from your X2 disks.
VVocal works at least as well or better than it did in X2 in X3.

I left X2 installed in case something went awry.  It crashes the second I select a clip and set it to create a region I get the white screen of death. I have not installed 3B.  Is there a separate executable fiile for V-Vocal on the X2 disk?  Thanks for your help...
R

I have the same problem. Especially if there are other tracks in the project that have melodine on them. I have a bunch of unfinished x2 projects with vvocal on them and it has deffinately been bummin me out that x3 crashes with them

Fantastic ... I did the X3b patch (sounds like a stop smoking campaign) and it worked.  It resolved the V-Vocal crash problem.  It "appears" to not be leaving those ghost tracks that X2 left after you did the V-Vocal and bounced it to track anymore which is a welcome change...
 
My life is a dream again... I can safely go back to Gaga Land, stop whining and go make music...
R

I recant my statement, X3 is a real mixed bag, some great things....but some really basic things are now awful.  You simply can no longer use V-Vocal.  It crashes literally every time.  Sadly I used V-vocal a lot now it wont even work in X2.  The second I click it I get a white screen. 
 
Can someone please help?  
thanks
R

You almost surely have a broken VVocal installation. 
You should be able to reinstall VVocal from the X2 disk, by doing a minimal X2 install. Please contact tech support and they should be able to help you out.
VVocal works fine in X3.

Buy doing a selective install of X2 you can select just VVocal and R-Mix (not included in X3) without installing everything else again.

I appreciate what you are saying, however I finally gave up and did some exploration of Melodyne yesterday, and ended up using that instead of V-Vocal...  it worked okay yesterday, well.. I thought... except SONAR will not boot up at all today.  I am now legibility sorry that I bought X3, gentlemen it is NOT ready for prime time!!  I wasted the entire day, the only day I had to record.  Client was really unhappy... and I lost money... only problem is I can no longer use X2 as it crashes now as well.  It's Sunday so I am assuming tech support is closed...
 
NOT HAPPY!!!!
___________________________________________________________________________________
A fatal error has occurred.
Module: c:\program files\common
files\vst3\celemony\Melodyne\melodyne.vst3
 
a crash dump file has been created here"
c:users\audio\appdata\roaming\Cakewalk\Sonar X3
Producer/MiniDumps\_10202013_133558.dmp
Exception Code: c0000005
Address: 0000000102545E12:0000000000000065:0000000000000065
As a result of this error SONAR is about to exit abnormally.
Should Sonoar Attempt to save a recovery copy of your work?
________________________________________________________________________________
 

I reinstalled the program (Melodyne) and it did absolutely nothing...
R