KDE - Icons gone

Today when I log in, my KDE desktop icons are all missing, and while I can
click on various apps on the "KDE Start button" they all do nothing at all
- not even an error message.

If I select Gnome or any of the other interfaces, everything works. If I
login as another user, the KDE icons appear and the "KDE Start button"
apps all work fine too.

Any ideas on what went wrong and how I can correct it?

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