My course no longer plays or previews

I've been working on a course for the past two weeks and it contains about 53 slides.  Suddenly, I can no longer preview or play the course when I publish it.  It simply hangs on the launch (I can see "Done" at the bottom of the browser after the progress bar appears).  The last thing I did was create an Engage activity and insert it in the slides. 

Is the file corrupted?  How do I know?

Should I break up the course into separate sections?  Is it too big?

HELP!

Deb

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