HTML5 Publishes Blank Screen On Random Files

Hello

I am an instructor and have issues with some files of my students Publishing/testing. 

For example: Classroom in a Book lesson files Publish correctly for some and produces a blank screen for others.

This is a huge problem that I have not been able to get any help with.  This happens in several versions of Animate and on several browsers.

I'm attaching two .fla files, one that tests/publishes fine, the other doesn't.  They have the EXACT same Publish Settings.

Any help or insight would be appreciated.  I can not grade the students work if the .fla file doesn't publish.

Oh brillant. I can not upload any files due to this error:

Correct the highlighted errors and try again.

• The attachment's not_working_w6.fla content type (application/octet-stream) does not match its file extension and has been removed.
  The attachment's not_working_w6.fla content type (application/octet-stream) does not match its file extension and has been removed.