Anyone Successfully Using Presenter with Audio Narration on a non-Adobe LMS Since Death of Flash?

I have had a HUGE number of issues with Adobe Presenter since the beginning of the year, when publishing output to HTML5 -- everything from distorted text to problems with animations, etc. I've managed to fix most of my issues one way or another, but the one I can't seem to beat is the "Buffering..." issue that occurs if my presentation has audio in it. When opening a published course, whether at the beginning or at a later slide via bookmarking after leaving a presentation in the middle and resuming, I get a "Buffering..." message which never resolves. It's not actually buffering though, because, if I go to the next slide the audio plays fine and, if I then go back to the slide I first accessed, it will play fine, too.

I've tried a number of things to try to "fake it out" -- such as putting a slide with no audio first, which then transitions to first slide with audio -- but it doesn't help. 

I've spent countless hours with Adobe tech support, but to no avail. At this point, it appears that Presenter is simply no longer a workable solution and I want to know is that the case for others as well? Is anyone able to use Presenter to publish a presentation with audio to HTML5 and upload to a non-Adobe platform with no playback issues?

I'm using Adobe Presenter 11.1 with PowerPoint 2016 on a Windows 10 machine. Our LMS is Cornerstone (although I've also been testing with SCORM Cloud, with the same results). 

Do we need to declare Presenter "dead" and go shopping for a different PPT-based solution, similar to Presenter, that actually works? I'm at my wits end!!!