[opensuse] No icons, distorted fonts

I don't know what happens, but now, when I start the system, I have lost
all icons (I can see the task bar, but no visible buttons, as for example the
K Menu). Same phenomenon when I use an application (KMail), the buttons from
the toolbar are not visible. When I start a terminal, the fonts in terminal
are distorted, but not the fonts which are displayed in the window border.
I have not updated my system, nor installed something else, all happens
suddenly with no apparent reason.
-- Can you give some suggestions ?
Bogdan Cristea
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