I’m not sure about all the platforms where this is an issue, but on my Windows laptop and iPhone (on the latest update and software) when I go on MLB’s website it doesn’t load those reels (like Star Watch, ICYMI, or game stories). It’ll play some of the sections and then just show a black screen and skip through another. I use strong shield configurations, so idk if that’s why but if not it’d be great if that gets fixed 
This loaded? also navigation between reels worked
Hmm, that one does load, but this one here is showing black screens and skipping around on my laptop (maybe there’s a few buggy ones?):