The keyboard layout setting on the Region panel doesn't work and it crashes the whole application, because the keyboard layout mechanism has been changed in GNOME 3.6: https://bugzilla.gnome.org/show_bug.cgi?id=687935
Even if cinnamon-control-center based on gnome-control-center 3.6, it contains an Ubuntu patch, that reverts this behaviour, and depends on a similar patch for gnome-settings-daemon:
Since Arch Linux has the vanilla gnome-settings-daemon 3.6, we can't use this panel. The easiest way to fix it is to replace the old layout tab with the new input tab by reverting the mentioned patch.
I think the Arch package maintainer @faidoc should know this first, then he can probably sort this out with the development team.
@City-busz is helping me with the cinnamon packages in Archlinux, so what he said is correct. The Ubuntu peculiarities breaks the app in other systems easily
This is staying as is for now, as it breaks this panel entirely in Mint. There are a number of changes in gnome-settings-daemon for ubuntu that this depends on. We're discussing options.
You could revert the patch at build-time for your distro.