I also use the VX-64 a lot and haven't had the problem until very recently. It doesn't happen every time, only rarely, and doesn't happen on every machine where I have SONAR installed. I am trying to come up with steps to reproduce to send to support. Perhaps you and I can figure it out.
It does seem to be dependent on some other condition. What happens if you start a new project and insert the VX-64?
I have a feeling this is one of those "UFO bugs" where people who've experienced the bug believe it exists, but most people don't experience it.