I think you should reset kwin to default settings. This is what I did:
1) Update system 2) Log out and ctrl+alt+f1 and log in 3) sudo service lightdm stop 4) rm ~/.kde/share/config/kwinrc 5) sudo reboot
I think you should reset kwin to default settings. This is what I did:
1) Update system share/config/ kwinrc
2) Log out and ctrl+alt+f1 and log in
3) sudo service lightdm stop
4) rm ~/.kde/
5) sudo reboot