Scratch

I have a "typewriter" app that stamps letters on the background when you click on the corresponding "keys".  The background script specifies that when the y-position is less than a certain value (means you've run out of vertical space), Stop All.  (It also specifies that if the x-value gets larger than a certain value, to reset the x-value and decrease the y-value to go to the next line).  But after stepping through the Stop All, the typewriter key sprites  continue to stamp if you click them, all that happens is that the background script is inoperative.  What's happening?

Thanks.