These have been occurring for me as well since the 779 build on multiple computers. Only happens to me with Questing profiles, custom ones, Kicks, etc. Always happens the first time you run the profile. WoW client completely crashes. If HB doesn't crash, you can restart and continue on if HB reattaches to the new process. I've been trying to watch for any common occurrences within a profile or anything else that I'm doing that could point to a cause but so far have come up with nothing.
I have cleared all cache folders and done a WoW repair. As said in other threads it fixes it temporarily, but within a day or two it comes back.
I have cleared all cache folders and done a WoW repair. As said in other threads it fixes it temporarily, but within a day or two it comes back.