Odd, something is intermittent then, because the weekend retreat one was not working when I posted the link earlier. Some of the sermons have had an image come through.
We use a lot of plugins. Multisite is active, so your plugin is running on both srcmarion.org and sermons.srcmarion.org. Sermons.srcmarion.org should use this image: https://sermons.srcmarion.org/wp-content/uploads/sites/4/2015/10/PlayButton.png, it is configured in Media Settings.
Network Active Plugins:
BibleGateway Links Shortcode
Captcha by BestWebSoft
Default featured image
Sermons.srcmarion.org plugins:
Jetpack by WordPress.com
srcmarion.org plugins:
Genesis eNews Extended
Genesis Responsive Slider
Jetpack by WordPress.com
List category posts
Page-list
Simple Social Icons
SubPages
Most of those enable shortcodes in articles, I think the only ones that affect featured image are the theme and Jetpack. I think we can deactivate Simple Social Icons since we get most of the same functionality from Jetpack.
If Genesis isn’t compatible with your plugin, I can accept that and try the Genesis specific plugin. (Has more bells and whistles I don’t need, but can probably make it work.)