This problem is really bugging me. I understand if nobody knows what's wrong but, at least, I would like to know if anyone experienced this already. I noticed something new, though.. even with the gravity not working, I noticed that I can still control the ball with the keys (like the one on the tutorial) but it's veeeeeery slow motion! So slow that I only noticed that there is movement now!

It's really strange. And I look for examples, codes, samples using physics and none of them have models in the levels! They all add the models in the script.

Sorry if I'm pushing here, but is it written anywhere that we can't have models in the levels while using the physics engine?