Bug In level editor
 

Well lets say iam going to make a level,when I test it works perfect but when I do some npcs example lay hearts one I test everything is gone.Why does this happen

because Stefan is getting lazy while coding it...

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You need to save regularily.

all you do when that happenes, is exit the level editor, and it will all be back to normal and saved... If it all goes to grass, don't close the level, close the level editor and log back in

Sorry I posted a mistake here

I will show an example I make an npc like

if (playertouchesme) {lay heart;}

or that bla bla.... and then when I test it wont get in testing it just freeze my level editor

I have heard that that happens when you start it with a wrong execution path, because Graal doesn't find the files. Have you tried to start Graal from the windows explorer?