Box2D bug and why looking so slow?

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I tried to build just a test where every second the left ball objects Y velocity is set to -15. This makes it "jump" upwards. The strange thing is that while this work every time in Mmf runtime and exe, 9 out of 10 times it does not work when I try it in Flash in the browser. I have tried chrome, firefox and explorer, downloaded the newest version of Box2D from the extension viewer, updated Mmf to latest build and set the Flash version to 10.0.0. Is this a bug or what is wrong? You can see the it here: http://www.varagtp.com/FlashTest.html

The right ball is just going on the regular bouncing ball movement.

Is it the same for you guys? It works like 1 out of 10 times for me depending on what browser I try in.

That is also the topic of my next question, why is it running so bad in the browser and is there something that can be done about it? The ball going up and down very smoothly in Exe and in mmf runtime, in the browser the ball is stuttering and parts of it looks like they are "missing" when it move.

Also here is the source MFA:

Thanks for this. I currently have no idea how to fix it :/

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It won't even open in a browser for me? This error pops up.