[tragomaskhalos]

Yes - this seems to me to be the same erroneous thinking that lead to the Ariane 5 maiden flight loss, caused by an integer overflow. There again the thinking was "this is effectively the same vehicle as its predecessor, therefore we do not need to test it thoroughly".

[skissane]

Similar thinking contributed to Therac-25 as well - the software worked safely on the old hardware, of course it will be safe on the updated hardware.