On my 64bit systems Alt-Tab and other key combinations are not working. ‘kwin --replace &’ solves it for the current session.
Now installing the packages from Factory, see if it’s the same with 4.3.80, met some odd dep. problems, already described elsewhere on the forum.
OK, Alt-Tab and other shortcuts DO WORK in the packages from KDE4:Factory
These show some dep. problems. I decided to uninstall some apps, save the list, and reinstall them after updating from KDE4:Factory.
I also change to Factory from Unstable and weird thing happened, the “Plain Desktop” option disappeared Also Alt+Tab works now without kwin --replace;)