Server Version#: 1.18.8.2468
Player Version#: 4.26.1
Both the above versions are merely the latest - this has been going on for several versions at least.
Occasionally I run across an album in my library where the album art is blank. It was there previously, but at some point something happened, and Plex won’t show it. It’s still present and selected in the Edit>Poster screen - it just looks like the screenshot on the Artist page or the Album Library view.
This is something that I find occasionally, too infrequently to identify a pattern, and it’s usually fixed with a ‘refresh metadata’ command. I’ve seen it in Firefox on both Linux and Windows 10, and in Chrome on Windows 10.
A minor inconvenience, but it has happened enough times that I was motivated to mention it.
Plex Media Server Logs_2020-03-03_16-58-39.zip (3.2 MB)

This may be more correctly tagged as a server issue. I just noticed that, when Plex Web loses posters, they’re gone on my Shield as well.
If you’re dual booting and using the same metadata (installation) in both Windows and Linux -or- one is a copy of the other… then STOP. Windows writes text files differently than Linux. The two are not interoperable.
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I’m not. Different machines entirely. Linux is the server, and Windows is accessing the linux server remotely.
Just a shot (kinda in the dark) with the caches.
- Clear them out. (Plug-in Support/Caches)
I say this because if it only happens sometimes and it’s a Windows browser, it might just be the browser . I’ve seen that happen too.
Not just Windows.
I’ll give the cache a shot the next time it happens.
It also happens occasionally on a Windows server, and it affects the apps I have - Android TV, Android Mobile and (maybe) the Roku as well as the web browsers. As reported, refresh metadata fixes it, not only for the browser, but for the other apps.
sorry for ducking out of this for a bit. I’m not quite out of a server/packaging issue.
I’ll have more time to devote a bit later today/tomorrow.
Okay, clearing the cache didn’t help.