1) /etc/kde/kdm/kdmrc: TerminateServer=true
2) restart
via http://www.linuxquestions.org/questions/slackware-14/next-kde-4-8-2-regression-firefox-thunderbird-joined-the-all-blacks-942693/
2) restart
via http://www.linuxquestions.org/questions/slackware-14/next-kde-4-8-2-regression-firefox-thunderbird-joined-the-all-blacks-942693/