Yep - I had huge issues with VV. When I went to X2 I uninstalled everything, including all the previous versions of Sonar, and it now seems to be working ok. It was working for a while in 8.5, but once it went that was it - crash everytime it was invoked.
I only use it now on small (1 possibly 2) bars, and complete the whole thing, including bouncing to clip and then removing the original (the clips sit on top of eachother) before starting another instance. And these are not large projects.
I know there are people who seem to have little issue, and right now it's working for me. However, I would maintain that V-V flies pretty close to the edge, and it doesn't take a lot to make it fail.