did that fix it for you?
https://bugs.launchpad.net/bugs/278471 < seems to be the same problem, but they 
have a different fix which doesn't work here

i haven't tried it, but maybe commenting out the line which starts
krunner in /usr/bin/startkde works, otherwise you can just do killall
krunner

krunner is the dialog you get when you press alt-f2, it's for starting
programs, accessing documents etc. - it's like gnome's deskbar

-- 
Monitor screen flashes on use of keyboard and mouse
https://bugs.launchpad.net/bugs/291691
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