I thought I would post this in case anyone else had problems. My KDE screen saver would intermittently fail to unlock even though I knew I was typing the right password. The solution was for some reason kcheckpass had lost it's setuid bit. To fix it:
Might help someone else.
Code:
sudo chown root:root /usr/lib/kde4/libexec/kcheckpass sudo chmod 4755 /usr/lib/kde4/libexec/kcheckpass
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