There it a bug where when you have a sprite with the "when I am clicked" event on it and when starting the project and you click the sprite instead of the green flag, the green flag will not act as though it was pressed. This project requires the user to click the green flag in the corner instead of the green flag on the project that pops up when refreshing the page. This does need to be primed after every save, similar to a thumbnail. You could also use these scripts on a thumbnail so that a separate sprite is not needed. Instructions on the sprite.
Please give credit when used. Test it out by clicking the green flag in the project, then refreshing and clicking the little green flag in the corner!