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Plex
A community for discussing Plex Media Server. Plex Media Server is a smart software that makes playing movies, tv shows, and other media on your computer simple.
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Useful Resources
- Plex FAQ - Frequently Asked Questions about using Plex Media Server and client apps with many useful links
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- Plex Hardware Transcoding Cheat Sheet - NVidia GPUs
- Organizing and Naming Your Media Files
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I believe it’s a known bug where it might - every great once in a while - change the art anyway, but this is how it’s supposed to work.
I’ve managed plenty of libraries over the years, and setting a custom poster keeps it that way— again, except in rare cases where something bugs out. but this is how it’s supposed to work.
if you still experience weirdness, I recommend going to “Troubleshooting” under your server settings and running both “Optimize database” and “Clean Bundles"
I'm not sure why, but things changed for me at some point. Several years ago I had a server that worked just the way you say -- the cover arts would never get updated without my say. But recently I've had two other fresh installs where the art gets overwritten regularly, even after optimizing.
I suggest making a post in the Plex user forums. Something’s not right with your setup if this keeps happening.