Car Game crashes(no pun intended)

I am using a python car setup(How To Make A Car Game In Blender 2.6 HD - YouTube) and the first level works perfectly then I did a full scene copy played it and blender crashed (twice):frowning:

Thanks for any help Fredstash

2.6x ?

there were bugs up to 2.62 (or 2.63) as regards the physic constraints
that caused crash

in 2.63 have been resolved