From what I've read, there has been a LOT of problems with V-Vocal crashing with multiple open clips. I was having major problems with V-Vocal crashing certain projects, always with multiple V-Vocal clips (with V-Vocal open, tracks not frozen). This had happened to me with an earlier version of Sonar (8.0 I think...) as well. I usually got an "un-handled exception error" and it was always in "cronus.dll".
After finding out this dll is part of V-Vocal, I also discovered that it was excluded in the plug-in manager under the DirectX audio effects (DX) category. I enabled it, my crashing problem went away, and I forgot about it.
I upgraded to the latest version (8.3.1.372) a few weeks ago when it became available. I recently was working on another project with multiple V-Vocal clips in it, and my crashing problem returned. After much cursing and editing short clips followed by saving after each edit, I started looking for info to send to Cake Support to get this resolved. Part of that was searching the forum and discovering many people have this same problem and error - and not seeing a fix reported. I did see a complete un-installation and purge of the Registry and new installation recommended several times though, including at least one post that said that was the recommended course of action by Cake TS.
I eventually remembered my earlier experience, and I checked the plug-in manager again. Low and behold, "cronus.dll" was once again excluded, which tells me that's part of the installation routine, and it's probably supposed to be that way. However, when I enabled cronus.dll, my crashing problem immediately went away, and it hasn't crashed since.
I don't think the "fix" is as simple as that, so for me, this is more of a workaround. But for me at least, it is working. I'd like to suggest that anyone else who is having this problem try this as well, and let's report the results back.
Good luck - and I hope this helps someone!!
Vinny