Internet cookies/cache data(/temporary internet files) is information saved locally to your machine whilst browsing the web to make it work properly. Sometimes they can mess up, and by clearing them via your browser settings, it may allow the game to run again. Hope this helps!
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I HATE YOUR STUPID GAME AND YOU BECAUSE THERE IS BIG BUG IN THIS GAME I TRIED REPORTING YOU BUT YOU WENT CRAZY AND DIDN'T CHECK THE BUG CAUSE YOU ARE THE DUMBEST PERSON I HAVE EVER SEEN!!!!!!!!!!!!!!!!!!!!!
Ok I am really sorry about the bug you encountered, I only just got your report! Unfortunately, this issue has never happened to me and I haven't been able to reproduce it - it sounds like a random flash player issue. Have you tried clearing your internet cookies/cache? Apologies, can we still be friends? :)