I installed plasma too, following the guide provided here (I noticed that qt5ct is not installed by the way) and I think I have the same problem, I login to plasma and when my session loads, I open almost any application, including the system configuration one, and I can see nothing, the icon of the opened app is visible on the taskbar but the windows itself is not visible, if you pass the cursor over the icon on the taskbar, you can view a preview of the window, but it doesn’t matter how many times you click on the icon, the window won’t be visible, I can also get a lot of artifacts on the screen sometimes while the windows is supposed to be visible, if I minimize it, the artifacts go away.
I checked if, as @mjl says, the session starts in wayland, but it doesn’t, it is actually using X11 in my system.
I was able to open some of the apps and they seem to display correctly, I opened “konsole”, the clock configuration GUI, the desktop configuration GUI, the KDE menu and the KDE widgets menu.
I looked for possible solution in the arch wiki, I tried this solution, but it didn’t change anything.
I also deactivated lightdm and activated sddm to see if that solved the problem, but nothing changed.
I wanted to try deactivating the compositor to see if that solved the problem, but I can’t access the GUI and I don’t know where that setting is stored.
Is there any log files I could provide so you can check what’s going on? If so, please tell me where I can find it or how I can get it into a file so I can see it on XFCE (I reinstalled XFCE as I can’t do much on Plasma right now).
I am stuck right now…
Hopefully this won’t happen when the online installer is released, I love KDE and I love EndeavourOS and I CAN’T LIVE WITHOUT THEM (T_T) (LOL).