Comment # 5 on bug 950012 from Wolfgang Bauer

(In reply to Michal ng from comment #3)
> Yes, I am using nvidia.

It has been agreed upon that this is a bug in the nvidia driver, see
https://bugs.kde.org/show_bug.cgi?id=343803.

Apparently it is fixed in the latest Beta version (361.18).
So either install that, or wait for the fix to enter the stable driver version.

Not much we can do here though.