Type "a" to begin counting and playing notes. This will keep going until you press "b" (and maybe hold it for a second or two). Click on the sprite and it will say "Mouse Down" with a drum beat, and when you release the mouse button it will play a cymbal crash. So, to see the issue, click "see inside" to edit the project, then press "a", wait a few seconds to see it counting, then click on the sprite and hold the mouse button down. You will still hear the counting script playing its notes, but its "say" blocks no longer show anything. The first one that it tried just made the "Mouse Down" speech bubble disappear. When you release the mouse button, then the counting speech bubbles will appear again. And the notes were playing all along, so you know that script was not paused or anything.
I discovered that the "say" block no longer works when you are editing the project and the sprite is clicked on and the mouse is held down. Only the first "say" block after the mouse-down is actually shown. After that, any "say" block will act like an empty one, even if it is not empty - if the sprite has a visible speech bubble it will be closed. ... Strangely, it behaves like this only in the editor, not when just viewing the project.
