It reloads for me ok :-) Couple of pointers - in terms of gameplay, what about the explosions doing you some damage if it hits you? Secondly and more practically - the dark man against dark background combination makes it quite difficult to make him out. If he was a lighter colour it'd be far easier!

It works fine for me! The updates seem great, really well done. The one thing I would say is that swing isn't the best thing to use with Greenfoot, it's far nicer if everything's just there in the same applet window (it looks better and avoids confusion.) I love the star animation too!

Yay, I beat him and confused him ;) It seems you can bulldoze him off the track at the start and then he'll get stuck. If you continue to push him across the grass to the other side, then he'll start driving round the track backwards!

Hmm, I don't get that message. Just the NullPointerException when it crashes. Either way though, as has been said already, it's all going to be guessing games without the source to look at. Feel free to upload it here or over on Greenfoot discuss, and then whoever gets there first will take a look!