iOS Podcast app not displaying enhanced podcast chapters
I'm troubleshooting why my m4a podcasts no longer display chapters in the native iOS Podcasts app, and other iOS podcatcher apps like Downcast. Yet chapter markers are still functional in the desktop version of iTunes, VLC, etc.
I use Garageband 11' to create the enhanced podcast. I then export the m4a enhanced podcast to an Amazon S3 server, and paste the link into Wordpress using the Powerpress Podpress plugin. For the past year or so I've been using Wordpress and Podpress without issue. But starting several months ago, no more chapter marks in podcatcher apps. The older podcasts still display they're chapter markers in the apps and desktop programs, but the new podcasts only display chapters on the desktop. For example, a podcast I made several months ago, episode 269, still shows chapter markers when viewed in native iOS Podcasts app, Downcast, etc. But all episode after 269 will only show chapters in desktop apps like iTunes, VLC, etc.
I've tried reinstalling GB. I've tried using a different version of GB to create the podcasts. I've tried using a different computer to create the podcasts. I've tried changing the filename of the podcasts on the server. I've tried updating all applicable desktop and iOS apps. So it seems that the issue is not my computer, Garageband, or how I'm creating the podcast itself. I've gone through and rechecked all of my Powerpress setting within Wordpress.
I've been regularly Google searching to see if anyone else is having this issue, and have found nothing to lead me in the right direction.
Website podcasts: http://www.farpastpost.com/podcasts/music-podcasts/
iTunes Store podcasts: https://itunes.apple.com/us/podcast/farpastpost-featured-music/id331270558?mt=2
Any suggestions?
mac pro, Mac OS X (10.5)