Box2d and 3gs

[mirzahat]

Hi

I just finished my game with Box2D and the Sparrow Framework and it has just one main screen with max. 10 box 2d objects on the screen.

So, on the simulator it works perfect, however, on my friends iphone 3gs the
game hangs when the physics are getting inited!

any tips? compile for thumb is turned off

regards,
mirza