For your question 2. make sure your graphic card drivers is up to date as well as the browser you are previewing the example in. Also it would be nice if you could precise what exact example you are referring to for this question so that we can investigate further about your question.
Ok! I checked both of them and you both got it. Any chance you can write down the steps or tell me how to change the shape of what they bounce off of?
Also, I tried to make a Spawn Object whenever they hit something. It works but if it bounces into a corner or off another ball then it will instantly replicate hundreds of times. Any idea how to limit that? Like one per second.