How to clear the stage selection area on Crayon Physics Deluxe?
I finally found a solution. I found another folder used by the game and deleted it, that cleared the stage selection area. The folder I had to delete is (I'm using Windows 7 64 bits):
C:\Users\<<My Username>>\AppData\Roaming\Crayon Physics Deluxe
Now I have a clear stage selection area again!
You can press Escape to bring up the menu and click "Clear Map" in it.