max Ram?

I wish I could help but if anything I would think that adding more available RAM should just make Java work with less problems. I'm sure someone will have an idea of what's going on.

erdelf, that sounds pretty strange, certainly Greenfoot shouldn't have a problem with using as much RAM as you can give it. If you really want help, please give a lot more information - How did you "give java more ram"? What exactly do you mean by "greenfoot doesn't start anymore?" - what happens when you try to start it, do you get an error message, is there anything in Greenfoot's debug log? On the site, are there any exceptions/error messages in the Java console (if you make it visible)?

here is how I gave Java more ram: added the environment variable: _JAVA_OPTIONS with value: -Xincgc -Xms2048m -Xmx4096m added system variable: Path with the path of java as value btw. I am using windows. well, even after deleting these variables it still doesn't work on the site

In that case it must be something else on your system that has changed which is causing the problems. I have no idea what it could be.

But if you deleted the variables again and it's still broken, it can't be the variables that are the problem. As Davin said, look for errors in the Java console, and also say exactly what happens when you try an applet, rather than just "it isn't working" -- that doesn't give any clues. (Incidentally, some browsers, such as Firefox, have recently disabled the Java plugin for security reasons. It's possible you could be affected by this, if no Java runs anywhere. Does this test applet load for you?)

When you're asking for help you've really got to make the effort to read posts fully and provide as much information as you can in return. Could you send a screenshot showing the scenario page on greenfoot.org with the Java console window open at the same time? (Sending it to gallery@greenfoot.org would be fine, make sure you put a brief explanation in the email). Also, have you tried a different browser?