I took the liberty to move this post in its own thread as it wasn’t related to that other thread.
There’s indeed been a change on a range of smart TVs. Or actually it wasn’t so much a change but the lack of an update for a critical component. Computers (and as such, smart TVs) use “certificates” to establish secure connections between devices. Those security certificates establish which devices to trust or not… when those smart TV vendors no longer updated an expired certificate, this has been causing Plex to no longer work if a secure connection is required.
This can be bypassed – however it’ll require both the server and the smart TV to be configured to disable secure connections. Not all server owners want that.
Now… I wonder if that’s actually been the problem with your Samsung TV.
Given you can still access your server and only have issues playing the media (but browsing through your library is fine)… this sounds like there might be a different problem.
To help troubleshooting this problem… could you double-check which version of the Plex app is installed on your Samsung TV? If I remember correctly, the version should be listed in the app’s settings section.