sure, I was trying to see for any hints in the shell, but the system freezes so I have no chance to see what's up on the shell. Error logs are empty.
Shell is clean as long as konqueror is up, but when it is down, all freezes including shell, mouse, keyboard.
I can tell what updates I installed, there are ca. 40 packages (bugfixes, security, normal updates) recommended by mdk update tool. I installed all of them.