Thanks, for mentioning it. Will leave it here as the problem is fixed:
Tried to use the slow KDE to run a one click install of installing KDE 4.2 from the OpenSuse site. Still the same symptoms.
However started with another GUI i think called icewm and did the same thing. I had to resolve some depency issues trough Yast2 and after a restart see there it worked again.
Now i just have to reconfig my Plasma settings. Maybe it would be already enough to reset Plasma trough killing Plasma and delete the Plasma folder, however i did not try that, if it ever happen again will try.
Maybe this is a good point to discuess the issues you had already with the GUI and how you fixed it.