Hi,
ok, then start a new scene, with two cubes set to collide at some point under gravity or else, and have a simple fsm with just a global transition ON COLLISION ENTER.
if that works, then you'll need to go back to you other scene and figure out what's not exactly right.
Please confirm the test scene as described above. Always double check a feature in its most isolated environment before fixing a bug like that.
Bye,
Jean