Just to chime in on this one:
I've seen crashes of this type also. I have also come to assume it has to do with incorrect propagation of changes but have never managed to actually track down the exact thing I was doing to cause the crash.
IMHO this is a big bug in LabVIEW which goes all too often under the "We can't reproduce it so it doesn't exist" flag.
The best solution here if you are able to package a project and reproducibly crash LV is to pack up the project and send it to NI with detailed information how to duplicate the problem.
Shane.