The problem seems to be that the plasma-desktop and kwin don’t start, and the keyboard doesn’t work either.
When I try to start plasma-desktio on the command line, I get the following error:
plasma-desktop: symbol lookup error: /usr/lib64/libplasmagenericshell.so.4: undefined symbol: _ZN19QAbstractProxyModel11setItemDataERK11QModelIndexRK4QMapIi8QVariantE
I also tried renaming the .kde4 directory, but I doesn’t help.