All KDE apps crash upon opening / interacting

As the title says. All KDE apps are crashing, including the crash handler.

I have entered the TTY and reinstalled the @kde-desktop group in fedora but that has been unsuccessful.

I am on Fedora 42 KDE edition, any help would be appreciated.

Can you check the installed version of the qt6-qtwayland package, by running dnf list --installed qt6-qtwayland ?

If it’s 6.9.1-2, then you could try downgrading to 6.9.1-1 as per 2375356 – qt6-qtwayland 6.9.1-2 breaks KDE Plasma lockscreen, requiring user to drop to TTY to unlock session

6.9.1-2 seems to particularly break the lockscreen, but some users have reported it causing broader problems.

UPDATE: a fixed version of qt6-qtwayland,6.9.1-3, has now been released into stable Fedora 42. So a normal sudo dnf upgrade --refresh should fix.

Perfect!! It worked perfecting with the koji downgrade. Thanks so much. It was just so strange and I was ready to just abandon kde for gnome but this is perfect!

Thanks again and lets hope they fix that package.

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