Thats probably just luck. I have it in “English” and guess what, not working at all 
I have disabled the direct play and stream play and work fine, but it does not a good solution
nevermind, the language option doesn’t matter
I’ts working now for me with Insecure connections allowed and always preferred. But yesterday that wasn’t working.
I also just got the modern layout in the app. But the version number seems to be the same.
I’m on a 2016 Samsung TV with Tizen 2.4
Playback is broken for me too.
Samsung 2017 TV with Plex client 5.25.3 platform 3
Latest PMS version
Set the connection to ‘always allow insecure’ but still no joy. My PMS dashboard says ‘buffering’ but playback never starts 
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Insecure connections was previous issue. This new one is about something else. New 5.25.3 version has problem with playback:
- Unexpected error occurred
- Unsupported multimedia file format
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I have same issues. The app is getting slower day after day. Some tv shows and anime shows don’t start. Firstşy buffering after that it gives playback error.
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Set prefer (and allow) insecure connections on the tv client and then restart the client. Just resolved it for me,
I set it to prefer on same network although always should work as well.
Hello,
I have a Samsung 2018, no solution from above seems to resolve the problem. This keeps occurring, nothing can be played.
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Stop suggesting solution that is not related with this issue.
Strange some people have issues. I’ve got version 5.25.3 installed and have seen no difference with playback from previous versions.
nethr: I understand that it’s very frustrating when software that was previously working decides to break however here’s no need for hostility, we’re all here to help. If you aren’t interested in that, you can immediately solve your issue by purchasing a new Plex client (post 2018).
I experienced BOTH issues you describe relating to the expired LE certificate authority. At first, setting allow insecure network fixed the problems and let me view my servers contents. A few days ago, I started running into the “unexpected playback issue”, and was able to resolve it by ONLY changing the “prefer insecure connections” settings and relaunching the Plex client app.
You know, it is not frustrating, its counterproductive. As far we now, latest version of app (5.25.3) which ment to solve issue with cert caused “downtime” of app on Samsung TV (mostly older tizen 2.4). Most of comments says pretty same thing. Nothing helps including “Insecure connection” because playback problem showed up with already insecure connection enabled.
Suggestions like “I did it with changing prefer insecure connection” make people confused. I would say, that ur case was pure luck.
People here should comment with logs lines.
Line my issue still being there after allowing unsecure connection and having this and others:
Unable to find client profile for device; platform=Tizen, platformVersion=2.4, device=16_JAZZL_UHD_BASIC, model=UN50KU6290
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Same issue here! 5.25.3 , v2.4 Tizen. Same issue since a couple of weeks. Please fix it!!
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I’ve tried it now, it only works by setting both entries to always.
Allow insecure connections: always
Prefer insecure connections: always
Very bad as a solution, but I confirm that it works
Samsung TV 2016 UE40KU6000
Tizen v2.4
Plex app v5.25.3
PMS v1.24.4.5081
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+1 for me. I tried allowing insecure connections and it didn’t work.
Then I changed language from English (UK) to English and it now works.
I’d been trying to play a 4K HEVC file.
Update: Re: the “Unsupported multimedia file format” problem (not the connection-related problem)
Some of my users say it’s working ok now. They can play my mkv x265 files from my Plex server on their Samsung TV’s. I can see them playing the content from my Plex dashboard. I haven’t updated anything, and they’re not sure if their TV updated the app automatically, so I’m not sure what fixed this.
UPDATE: the user that was successful was watching a movie. MKV container, x265 video, e-ac3 audio. that same user then tried to watch an episode of a tv show (exact same container and codecs), but failed. “Unsupported multimedia file format”. what the hellllll
Setting insecure connections on my one Samsung TV seems to sort the issue but not on the other. Guess we’ll just have to wait for another update 
I too am experiencing this issue. Everything played fine, and then there was an update to the Plex Player for Samsung TV and now there’s a growing handful of files that don’t want to play that played fine last year on the same TV with the same settings. I’ve tried fiddling with quality settings, but it still won’t play the files for me. Clearly something has changed in the player app that’s gumming up the works for some reason. I hope that they fix and/or remove whatever changed to get things back to working, because everything was working fine in the previous version.
I had to set both the server and TV to insecure to get my mothers TV working again, on the server preferred was not enough, it had to be set to disabled.
