KDE strange behavior

I'm running KDE 4 today it started behave strangely when I login computer is restarted. I have reinstalled x11/kde4, x11/xorg and video driver ports but it didn't help. Second try was to remove ~/.kde4 folder and it did help when I logged in computer wasn't restarted but as soon as I started changing some settings in KDE desktop same thing happened. Something is written on terminal but there is no way to see it because it happens very fast.

Could anyone suggest what to do or have an idea what can be causing this?
 
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