i postet first a wrong installation link on Wednesday morning.
The first link was for a privat repo which includes Mate-1.4.0.
If you have used this link
revert all changes.
Pls, remove the release package 'mate-desktop-release'.
Than remove all installed packages from the dropbox repo,
and downgrade all updated packages back to fedora's version.
To revert all changes in yum use:
sudo yum history info <id>
The right download link is
yum install https://dl.dropbox.com/u/105479527/Mate-Desktop/fedora-release-extra-18/mate-desktop-fedora/noarch/mate-desktop-extra-release-18-1.fc18.noarch.rpm
This repo link doesn't update any fedora package.
MDM and mdm-user-switch-applet aren't include in this repo because of changes with mare-panel-1.5 and missing patches in fedora's mate-desktop, mate-session and caja.
Big sorry for that confusion