Javascript stopped working

I've been using JS successfully, but for some unknown reason, I cannot get it to execute in an SL2 project I have updated to SL360.

In particular, I use the window.history.back method to return to our LMS. It's always worked fine. In this project, however, it does nothing. I've tried plugging in a JS alert but that won't execute either.

There's nothing unusual about this project that I can see. Any suggestions on types of things that might render the execute javascript function inoperable?

 

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