Ball falls through the floor... why?

Ok, it makes sense, the distance between the floor and the ceiling is a bit long, so when the ball hits the ceiling and falls close to a straight angle it gains a lot of speed...

Well... I increased "Solver Interaction Count" from the default (6) to 12 and nothing seems to happen, I increased it to the maximum (100) and when the ball falls straight from the ceiling it doesn't pass through the floor, however in the rebound it does... so there must be something else.

I tried the solution described by robertbu and it seems like "Fixed Timestep" has a more powerful impact in the collision detection system.

Thanks for the tip, it was useful anyway.

It does what, exactly? Its supposed to bounce, correct? Where is it going once it has bounced on the floor, or however it's rebounding?

The ball bounces correctly on the floor, but it does not collide with the floor for a second time, instead it passes through just as if the floor wasn't there, which is curious since it looses a lot of speed after the first collision. I restored "Solver Interaction Count" to it's default (6) and reduced "Fixed Timestep" (in Edit->Project Settings->Time) to 0.01 and the problem seems to be solved... I need to do more testing but for now it seems solved.