I have a weird problem with KDE Plasma right now. I'm using kubuntu vivid.
sorry if I need to post to a kubuntu form and not here.
KDE programs crash or do not work properly if i use one particular login,
but I can not reproduce these issues with a newly created user and KDE settings.
I first cleared a lot of stuff out of ~/.kde/share/config including plasma*.
Later, I tried renaming the .kde directory to something else. Still the problem persists.
Here are the symptoms.
I run Qt Assistant and hit Ctrl+F: I get an error dialog:
Ambiguous Key Assignment exists. Please configure your shortcuts.
I go to "System Settings - Shortcuts"
I try to redefine Ctrl-F and the shortcut configure window crashes.
ALso, I invoke certain shortcuts from Konsole that used to work (Ctr+PgUp and Ctrl+PgDn) and now they cause the Konsole window to crash.
These symptoms happened after a recent upgrade to KDE5.