Version:            (using KDE 4.1.2)
OS:                Linux
Installed from:    Fedora RPMs

I enabled the "Show Paint" effect about a month ago and then disabled it after about a minute of usage. I was using KDE 4.1.1 back then. Since then, I upgraded to KDE4.1.2 through Fedora rpms.

The problem is: I still see remnants of this effect from time to time (let's say, every ~10 minutes), most notably in firefox, but also in qt applications. The screen does not change its color the way it does when the effect is activated in a normal fashion. I see these paint highlight lines only.

When I roll the mouse over these lines sometimes these lines move around slowly as the mouse pointer passes over them, sometimes they don't. And sometimes they disappear with a simple mouse pointer move. If they don't disappear by mouse movement I have to minimize-remaximize the window in consideration to get rid of them.

I am using a nvidia, with proprietary drivers. 

I'd be glad if someone can offer me a workaround (removing/recreating a config file etc) until we find a fix, since this is annoying me every day.