Recent update to the following packages breaks KDE:
Xorg-x11-server-Xorg-1.14.4-10.fc20.x86_64 > 1.14.4-11.fc20.x86_64
Xorg-x11-server-Xvfb-1.14.4-10.fc20.x86_64 > 1.14.4-11.fc20.x86_64
Xorg-x11-server-common-1.14.4-10.fc20.x86_64 > 1.14.4-11.fc20.x86_64
Screenshots:
https://i.imgur.com/nYsX069.jpg
https://i.imgur.com/8MbX65q.jpg
As you can see from the screenshots, non KDE apps work properly (well, sort of).