Publishing issue (slide display) with SL360

I have just completed an eLearning course.  When I view in SL, in edit mode or even when previewing entire project, everything looks great!   When I publish to Review360 or LMS, the backgrounds of the slides look gray.   They are supposed to be white.  

I have done everything I can think of.  I updated drivers for my PC, I even discovered in the process that I had an older version of Windows that was no longer supported so I updated that.  Still happened.  So, uninstalled and reinstalled Storyline.  Still happening.   I sent the file to a co-worker and had her publish it to Review 360 and viewed her version and the slides are still gray.  So, I've ruled out a graphics card issue, computer issue - I'm guessing now that it's something with the file itself.  So, is there anyway to fix it or am looking at having to redo the course?

Pics attached.

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