Another update, another new bug?

The setup, which was working previous to the last update:

A slide with voiceover (TTS, for now), introducing a video on the next screen. A trigger is in place to advance to the next screen when the media (TTS MP3 file) completes.

After the latest update, this trigger no longer works in HTML5. It does work in Flash. Also, if memory serves, it also works in preview mode.

I have tried deleting the trigger and redoing it; also deleting the MP3 file and redoing it.

Ironically, on the screen with the video, there's a trigger to advance to the next screen when the media completes -- but this media is the MP4 video. This works just fine.

Thanks in advance for any advice!

Update, five hours later ...

So I changed the trigger from When Media Ends to When Timeline Ends. That works okay. But then when it advances to the next screen, the MP4 video, set to play automatically, does not play. Seek bar moves, however, and clicking on the seek bar causes the video to play.

I'm now going to try rolling back to an earlier version.

Update, Next Morning ...

After rolling back to the May 22 build (3.16), I see no issues with automatically advancing to the next screen ... but there's still a problem with getting the video (it's on the 4th screen, if that matters) to play automatically in Chrome (build  67.0.3396.87 - 64 bit).

The video autoplays in Firefox, Internet Explorer, and Edge. Perhaps this is a new thing with Chrome ...