Same source code, compilation on 2 different MAC => not the same beahviour

Question

Hi All,

We have 2 MAC for iPhone development with the same XCode version.

When I build the application on MAC 1 and run it on iPhone 3GS, it does not work properly: many crashes.

When I build the application on MAC 2 and run it on the same iPhone, it works.

We have checked target settings, Xcode preferences and there is no difference.

Any idea where to look for ?

Olivier