The only thing this sounds like is if you were running the web browser version and the game was being stopped by script blockers. If you're running the Windows 64 bit version on a Windows 64 bit PC and it's giving you a black screen at start up then that's hard for me to explain. I haven't encountered that problem before. I assume you've tried running it a few times, just to check that it's working?
If so, then maybe try the
web browser version instead, or the
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version? Those might work. (Although the web browser version does sometimes get blocked by script blockers, as I mentioned above.)