C2 r76 64bits; Intel Core i5-2500K 3.30 GHz (x4), 8 Go DDR3, NVIDIA GeForce GTX 560 Ti (driver 285.62), Win 7 Pro SP1
Firefox 9.0.1; Chrome 16.0.912.63 m
Apparently, only the collision polygon of the first animation frame seems to be taken into account when physic is involved (click the button to cycle through the animations frames)
Click sprite2 to spawn a ball
Right click a ball to delete it (automaticly destroys outside of layout)
Expected behavior: Each animation frame collision polygon is taken into account when the animation frame is changed
Happening: Only the first animation frame's collision polygon is used.
You can switch the order of the animation frames to check and confirm.