This is the case since quite a few versions back (if not since the introduction of the feature).
Plex/Web only shows initials in a circle instead of the real actor images (on safari). If this is intended then please change the names to be a list instead so we can save some space on the GUI.
Setting the CastList to “The Movie DB” + refresh MD fixed this. thank you Otto!
I have never touched or seen that config screen and my settings where using IMDB. Maybe TMDB would be a better suited default value…
If tmdb will be/is likely gonna be the only source for actor pictures, It be nice if plex displayed this info… similar to (Plex Pass required) or (restricted audiences)