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The flatpak version works without any problems.

Yes, it's a nvidia thing, based on my research. I didn't pick up on this because I don't usually use wayland. But when I switched to wayland with Cinnamon (not KDE) and started Plex as is based on the package, I ran into the same issue that you did. It seems like these are two separate issues. The blank screen is solved based on using this env variables, but the other nvidia issue remains, and is DE-independent. Does the same issue exist with the flatpak version? If so then it's an upstream issue. If not, then it's a packaging issue and we need to find a solution.

@username227

I added those variable. The app starts now as it should, BUT all videos throw a black screen. Audio works. I think this is an Nvidia Problem? Well, I'll switch to AMD GFX anyway.

See this comment for a similar issue. Try running the program with this variable:

QMLSCENE_DEVICE=softwarecontext QT_OPENGL=software Plex

and let me know if it helps. also those on KDE working try it as well to make sure it doesn't break anything.

https://bbs.archlinux.org/viewtopic.php?pid=2205003#p2205003

My pacman -Qi plasma-desktop output is basically the same as @wurstbrot's. Also on 6.5.3-1.1 so it's definitely a CachyOS thing.

I ran Plex from terminal. It was spamming this.

[84746:84802:1123/203558.752647:ERROR:gl_context_egl.cc(277)] eglCreateContext failed with error EGL_BAD_CONTEXT [84746:84802:1123/203558.752651:ERROR:gpu_channel_manager.cc(771)] ContextResult::kFatalFailure: Failed to create shared context for virtualization. [84746:84802:1123/203558.752654:ERROR:shared_image_stub.cc(470)] SharedImageStub: unable to create context [84746:84802:1123/203558.752657:ERROR:gpu_channel.cc(449)] GpuChannel: Failed to create SharedImageStub

I don't see anything obvious in the logs. It's interesting that both of you are using CachyOS. @wurstbrot your plasma-desktop package is version 6.5.3-1.1, while the official package from the extra repo is 6.5.3-1. I'm assuming CachyOS patched the package somehow. It might be that this is due to some weird patch CachyOS added. I don't use that OS, so I can't help. Maybe someone else can...

EDIT: Have you tried looking at the output of running Plex from terminal? The command should just be Plex

@el-gazzle

❯ env | grep -E 'WAYLAND_DISPLAY|XDG_SESSION_TYPE'
XDG_SESSION_TYPE=wayland
WAYLAND_DISPLAY=wayland-0

❯ pacman -Qi plasma-desktop
Installed From           : cachyos-extra-v3
Name                     : plasma-desktop
Version                  : 6.5.3-1.1
Beschreibung             : KDE Plasma Desktop
Architektur              : x86_64_v3
URL                      : https://kde.org/plasma-desktop/
Lizenzen                 : LGPL-2.0-or-later
Gruppen                  : plasma
Stellt bereit            : Nichts
Hängt ab von             : attica  baloo  emoji-font  gcc-libs  glibc  kauth  kbookmarks  kcmutils  kcodecs  kcompletion  kconfig  kconfigwidgets  kcoreaddons  kcrash
                           kdbusaddons  kdeclarative  kglobalaccel  kguiaddons  ki18n  kiconthemes  kio  kirigami  kirigami-addons  kitemmodels  kitemviews  kjobwidgets
                           kmenuedit  knewstuff  knotifications  knotifyconfig  kpackage  kpipewire  krunner  kservice  ksvg  kwidgetsaddons  kwindowsystem  kxmlgui
                           libcanberra  libksysguard  libwacom  libx11  libxcb  libxcursor  libxi  libxkbcommon  libxkbfile  libplasma  plasma-activities
                           plasma-activities-stats  plasma-workspace  plasma5support  polkit-kde-agent  powerdevil  qt6-5compat  qt6-base  qt6-declarative  sdl2  solid  sonnet
                           systemd-libs  systemsettings  wayland  xcb-util-keysyms  xdg-user-dirs
Optionale Abhängigkeiten : bluedevil: Bluetooth applet [Installiert]
                           glib2: kimpanel IBUS support [Installiert]
                           ibus: kimpanel IBUS support
                           kaccounts-integration: OpenDesktop integration plugin [Installiert]
                           kscreen: screen management [Installiert]
                           libaccounts-qt: OpenDesktop integration plugin [Installiert]
                           packagekit-qt6: to install new krunner plugins
                           plasma-nm: Network manager applet [Installiert]
                           plasma-pa: Audio volume applet [Installiert]
                           scim: kimpanel SCIM support
Benötigt von             : Nichts
Optional für             : cachyos-emerald-kde-theme-git  cachyos-iridescent-kde  cachyos-nord-kde-theme-git
In Konflikt mit          : Nichts
Ersetzt                  : Nichts
Installationsgröße       : 36,53 MiB
Packer                   : CachyOS <admin@cachyos.org>
Erstellt am              : Di 18 Nov 2025 17:48:39 CET
Installiert am           : Sa 22 Nov 2025 18:57:26 CET
Installationsgrund       : Ausdrücklich installiert
Installations-Skript     : Nein
Verifiziert durch        : Signatur

I had to paste the plex.log to github, because more than 5k characters. https://gist.github.com/Pflaumenaugust/14661ee2a208ab3f48884e70b0181bf4

@wurstbrot @Eyeball I can't reproduce. I'm also on KDE Plasma on Wayland

Maybe you can find some info in the logs? They should be under $HOME/.local/share/plex/Logs

Some output from my system to show my current setup

➜  ~ env | grep -E 'WAYLAND_DISPLAY|XDG_SESSION_TYPE'
WAYLAND_DISPLAY=wayland-0
XDG_SESSION_TYPE=wayland
➜  ~ pacman -Qi plasma-desktop 
Name            : plasma-desktop
Version         : 6.5.3-1
Description     : KDE Plasma Desktop
Architecture    : x86_64
URL             : https://kde.org/plasma-desktop/
Licenses        : LGPL-2.0-or-later
Groups          : plasma
Provides        : None
Depends On      : attica  baloo  emoji-font  gcc-libs  glibc  kauth  kbookmarks  kcmutils  kcodecs  kcompletion  kconfig  kconfigwidgets  kcoreaddons  kcrash  kdbusaddons  kdeclarative
                  kglobalaccel  kguiaddons  ki18n  kiconthemes  kio  kirigami  kirigami-addons  kitemmodels  kitemviews  kjobwidgets  kmenuedit  knewstuff  knotifications  knotifyconfig
                  kpackage  kpipewire  krunner  kservice  ksvg  kwidgetsaddons  kwindowsystem  kxmlgui  libcanberra  libksysguard  libwacom  libx11  libxcb  libxcursor  libxi
                  libxkbcommon  libxkbfile  libplasma  plasma-activities  plasma-activities-stats  plasma-workspace  plasma5support  polkit-kde-agent  powerdevil  qt6-5compat  qt6-base
                  qt6-declarative  sdl2  solid  sonnet  systemd-libs  systemsettings  wayland  xcb-util-keysyms  xdg-user-dirs
Optional Deps   : bluedevil: Bluetooth applet [installed]
                  glib2: kimpanel IBUS support [installed]
                  ibus: kimpanel IBUS support
                  kaccounts-integration: OpenDesktop integration plugin [installed]
                  kscreen: screen management [installed]
                  libaccounts-qt: OpenDesktop integration plugin [installed]
                  packagekit-qt6: to install new krunner plugins
                  plasma-nm: Network manager applet [installed]
                  plasma-pa: Audio volume applet [installed]
                  scim: kimpanel SCIM support
Required By     : None
Optional For    : None
Conflicts With  : None
Replaces        : None
Installed Size  : 36,00 MiB
Packager        : Tomaz Canabrava <tcanabrava@archlinux.org>
Build Date      : di 18 nov 2025 14:50:54 CET
Install Date    : za 22 nov 2025 17:52:07 CET
Install Reason  : Explicitly installed
Install Script  : No
Validated By    : Signature

Got the same problem as @wurstbrot. CachyOS, KDE Plasma 6.5.3, Wayland.

The Plex window opens, you can see the edges of it (where you drag to change size) but the inside is just see-through. Moving your mouse inside it just leaves a trail of the Plex icon.

For now I've installed the Flathub version so I'm not bothered by it, but thought I'd try to give a bit more of a description of what's happening.

Does not work on kde-plasma 6.5.3 wayland. Just an empty window pulling trails. Sorry for the poor description, but I'm a Linux n00b.