I see this on my system:
Fedora Kernel: vmlinuz-3.8.3-203.fc18.x86_64
KDE: 4.10.1
Hardware: 4 core Phenom x86_64
It's reported as https://bugs.kde.org/show_bug.cgi?id=314859 and is described there as fixed.  Does anyone know when the fix will be pushed into Fedora Updates?