Same issue here.Same context.
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Same here, with a synology ds918+
Smb share to a macmini 2018 with sequoia
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issue also with a movie library this morning
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Hi, I have an iMAC with an Apple Silicon M3 SOC. Since I updated to macOS 15 (Sequoia) Plex Media Server seems to have gone crazy. If I try to scan a library it loses most of the data. The files are on a Synology DS2422+ NAS and are connected to the Mac via Samba protocol. I tried restarting everything, NAS, Mac, Router several times and I noticed that there are times that Plex sees the files and scans them normally. Then on subsequent scans or especially if I perform one manually it loses 2/3 of the data. I checked the permissions of the Plex application but everything is regular. Currently I have noticed this problem on the Movies library and not on TV Series. Unfortunately I do not have a backup with Time Machine because I would have immediately returned to macOS 14. I hope that the Plex developers solve it with the next updates. Thank you very much 
for your work.
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Hey @Atomatth - just checking in to see if you’ve made any progress with this investigation? Do you need any additional details, logs, or testing done? Anything we can do to assist please let us know! Thank you!
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Rolling back to PMS 1.40.x seems to have resolved the issue for me. Might be worth a shot for you to try. Just remember to turn off automatic updates in PMS so it doesn’t update to 1.41 overnight.
Edit… never mind, it just rescanned and pulled a ton of movies from two different libraries.
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Thanks @jasonwalker I think I have enough logs. It looks like everyone here observing this issue is similarly running MacOS 15 Sequoia with their content hosted on a Synology NAS. One thing that might be helpful to know is the Synology OS version. Sharing a copy of your DB might be helpful too, along with how your Synology share is setup (share path, permissions).
I have a suspicion that issue lays somewhere between Sequoia and Synology, Plex is just highlighting the issue.
As a test could you create a new library connecting to the same share path as one of your affected libraries? Then observe if this newly created library is showing the same issue.
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Share paht is /volume1/Filme 1/Filme1
Permissin is read/write
Dsm 7.2.2-72806
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MacOS 15 Sequoi
same issue with creating a new library
Dsm 7.2.2-72806
Share path is /Volumes/Video V2/Séries
Permission is read/write
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MacOS 15 Sequoia
DSM 7.2.2-72806
Share path is /Volumes/Media/Movies
Permission is read/write
One thing to note is that I have Emby running on the same server pointing to the same library folders and there is no issue there. So your suspicion between Sequoia and Synology might not hold water.
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No doubt! Thanks for the extra details. Looks like everyone observing the issue is running very similar setups.
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MacOS: Sequoia 15.0 (latest)
Plex Server: 1.41.0.8992 (latest)
Synology DSM: 7.2.1-69057 Update 5 (running on an RS819) (latest)
Synology SMB Service: 4.15.13-0877 (latest)
Synology File Station: 1.4.1-1559 (latest)
- 24.68 TB Btrfs ‘Media’ Shared Volume
- SMB Share Mounted in MacOS: /Volume/Media
- Synology ‘plex’ account has read/write permissions (authenticated to share)
Affected ‘Movies’ library path: /Volume/Media/Movies
Unaffected ‘TV’ library path: /Volume/Media/TV
No other apps or services that connect to the Synology network shares are affected or impacted. I have several Plex media libraries to this mounted ‘Media’ share that are not impacted (TV, Fitness, Comedy, Concerts, Home Movies). For me, it appears to only be impacting about half of my Movies library at this time.
My ‘Media’ volume is mounted in MacOS just via the standard OS method and never disconnects or drops. Connected via 1Gbps wired network on both ends.
Also confirming that I can create a new Movies library to the same path and recreate the same issue - seemingly the same movie titles impacted. Creating a new TV library to the same TV path is still not impacted.
I will DM you a link to download my database file. We really appreciate you looking into this. Thank you!
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I took your suggestion and created a new test library. right off the bat the same movies are missing. Whats interesting is that I can restore a DB file from before the macOS update, and Plex will hold showing those movies for about an hour or so. After that it reverts to the same issue.
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I’m not experiencing this problem, but had a time machine backup break and found that Sequoia had smbd full disk access turned off by default. Upon turning that on my backups finished fine. Might want to check it for poops and giggles.
Settings > Privacy & Security > Full Disk Access
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As I mentioned earlier in this thread, I eliminated both Sequoia and Synology as the cause simply because Infuse wouldn’t work on the missing files if it was either of those, but they ALL work on every one I tested thru Infuse. It would be a widespread system problem if it was either of those.
The discrepancy appears to be how Plex is acknowledging/recognizing the file. Since the file isn’t missing, we just have a trashcan on it and Plex recognizes it as missing, but the file isn’t unavailable on the Get Info screen.
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Im experiencing the exact same issues as all above. Has happened on sequoia from beta to full release.
Went back to Sonoma, jumped the gun again to sequoia, problem still persists.
Can play through plex/web when unavailable, but not on other devices.
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Scans for movies are also very slow
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Is there any new information anyone wants to share that might help us to find the root of this issue?
Its very hard to keep it from happening unless constantly opening Finder to make sure the files are accessible. It doesn’t seem to have much rhyme or reason.
At one point last night, it disconnected, stopped the video I was playing, and marked it as watched, SO I restarted it again, than it happened again 2 minutes later, but after I started it a 3rd time, it played through the rest of the video without an issue…
At this point downgrading macOS is much more difficult to do now that the full release of Sequoia is out.
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strange. no more issue for me when i scan my library, tv shows or movies. done nothing.
Can confirm that I’m still experiencing the issue. I’ve disabled all auto-scans and emptying the trash on scans. I manual library scan will flag the same items are missing - updating library path will restore them.
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