Missing Resume Buttons

Hello.  I realize this posting is fairly old, but I am experiencing this same issue. Users attempting to resume online courses are getting the prompt but no buttons to take action.

To dig a little deeper, I have 8 courses that were published in 2015 (by a 3rd party, I do not have the source files). It appears they were published for Flash Player output with HTML5 as backup.  With Flash Player disabled, these courses will play in Chrome without problem (launches in HTML5 determined by spinner @ course load).  In Internet Explorer & Edge, however, the courses don't launch. It appears the redirect to HTML5 doesn't happen.

To try to remedy this, I opened the .zip file and modified the launcher.html file. In this file there is a variable for the start page that was showing as index_lms.html.  I changed this to point to the index_lms_html5.html page. 

After republishing SCORM output and loading to our LMS, viola, the course successfully launched in Internet Explorer (version 11).  Sadly, the excitement was short-lived, however, as I tested in Chrome. Where this course was previously working, now I got the same issue described in this post (and another from a few years back).  The course redirects to the HTML5 page but the course resume prompt does not have any buttons displayed to which the student can take action.  

In addition, when using Edge, this problem appears on both the course I modified (to point to the HTML5 index page) and the other 7 courses that still point to the original index page (see attachments).

Any ideas why this may be happening?  Thank you.