KDE Plasma troubleshooting
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This is a placeholder page to document all kinds of issues with KDE Plasma, and their fixes.
Weird Plasma behaviour
This is an unlikely scenario, but it already happened. If you experience weird KDE plasma behaviour with new activities being constantly created, being unable to delete those extra, unwanted activities, being unable to let desktop configuration stick... check the relevant file ownership and permission. In particular, check that everything in ~/.kde, ~/.cache, ~/.config, ~/.dbus is owned and writeable by the current user. If not, rectify the file ownership: this probably was the source of the erratic behaviour.
Other things to check:
Tooltip colours unreadable
In some non-native KDE Plasma applications, the tooltips may be made unreadable by the fact that we have the same or very similar colours used for the background and for the text.
This can be fixed in KDE system settings:
Appearance -> Colors -> Options: Disable "Apply colors to non-QT-applications"
This bug has been observed in Gimp, Pinta and other applications.