The 64m limit is for working collision lods like geometry/fire geo/
view geo/roadway etc.
If your object is bigger than that it will still work, but the collision detection won't. It could then happen that e.g: bullet
impacts will not appear on the right places ...etc.
The crash to desktop i'm not sure about - i'll have a look around
to see if i find a real size limit.
~S~ CD