Kde plasma desktop - no kwin no taskbar

i was running two sessions (users) in parallel when my computer crashed. now when login into my primary account i see the desktop wallpaper but no taskbar or windows (kwin ?). sometimes (several login attempts) i am able to start cmd+alt+t the console. once i tried to start dolphin via console - it showed up but only the window decoration.
actually this happened erratically before when i rarely used my secondary account (user) but a reboot always fixed it. but now it seems to be permanently broken. i urgently need to login into my primary account. i tried to restart things:
plasmashell --replace
kwin_x11 --replace &

i have no idea where to look at.
is there a certain check list to start with: x11 ? wayland ? kwin ? plasmashell ? config files i could recover from backups (timeshift, rsync) ?

my secondary account works normal but i urgently need to use/fix my primary account.

thanks for any help

deleting ~/.config/plasma-org.kde.plasma.desktop-appletsrc and then reboot fixed it


thanks !

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