Game reset

I was creating a game similar to Flappy Bird, and I ran into a problem. I had a script that says "When Flag clicked", "broadcast Green Flag". Then I could use this message instead of a "when flag clicked" block so that I could have the game broadcast this to start over the game.However, when I tried to do this, my game slowed down and started killing the player randomly.
Is there a bug in Snap!, or am I doing something wrong?

Here's the link:

I'm terrible at games, so can't really test this myself, but it seems to work for me. But you don't have to invent your own signal:

page 100 of the manual. :~)

Wow, thanks, very helpful! That helps! Every time I used a different message, it broke the game!
I guess you have to have to have a script for everything!