I saw a "click to start" but wasn't sure what to click, just left mouse button clicking didn't seem to do anything.
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I see I've found that this is an issue with Scratch for some reason that the button works sometimes but not 100% which is quite annoying. Though it normally works the first time it's used. Though I do believe I have now fixed this issue you will just need to re-download the game. As I had to make some changes to the coding.