Well here we go.
Next time you get a problem from a new Mac Book Pro 
get the client to reboot with the original disk .
In my case Snow Leopard also it is important to load the updates.
I have completed 200 frames Quick Time .mov at high res on Fire fly.
So Thank you 
Why the crashes should happen I have no idea, how the corrupt file's happen no idea.
Oh by the way if I get back to you with crashing you have the answer.!!
Now to get on with the work.
Animation has to be finished (on show) in the Indian Museum by October.
If your interested you can see the Museum on http://www.saibaba.me.uk
One day we are hoping to have a animation team. Until then I have been given the job.
Thanks again John Casky